istanbul cover mocha Code coverage command doesn't work - mocha.js

I have a problem running this command istanbul cover _mocha Throws the error as follows:
No coverage information was collected, exit without writing coverage information
C:\Users\mhass\AppData\Roaming\npm\_mocha.CMD:1
(function (exports, require, module, __filename, __dirname) { #IF EXIST "%~dp0\node.exe" (
^
SyntaxError: Invalid or unexpected token
at createScript (vm.js:56:10)
at Object.runInThisContext (vm.js:97:10)
at Module._compile (module.js:542:28)
at Object.Module._extensions..js (module.js:579:10)
at Object.Module._extensions.(anonymous function) [as .js] (C:\Users\mhass\AppData\Roaming\npm\node_modules\istanbul\lib\hook.js:109:37)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
at Function.Module.runMain (module.js:604:10)
at runFn (C:\Users\mhass\AppData\Roaming\npm\node_modules\istanbul\lib\command\common\run-with-cover.js:122:16)

Related

npm run dev: [webpack-cli] Error: Cannot find module 'gensync'

After updating to bootstrap5, I find that I get this error when running mix via npm run dev.
I reverted back to my previous branch, but I'm still getting the same error when running npm run dev.
gmaddock#Wrecked:/var/www/dev-events$ npm run dev
> dev
> npm run development
> development
> mix
[webpack-cli] Error: Cannot find module 'gensync'
Require stack:
- /var/www/dev-events/node_modules/#babel/core/lib/gensync-utils/async.js
- /var/www/dev-events/node_modules/#babel/core/lib/config/caching.js
- /var/www/dev-events/node_modules/#babel/core/lib/config/files/utils.js
- /var/www/dev-events/node_modules/#babel/core/lib/config/files/package.js
- /var/www/dev-events/node_modules/#babel/core/lib/config/files/index.js
- /var/www/dev-events/node_modules/#babel/core/lib/index.js
- /var/www/dev-events/node_modules/laravel-mix/src/FileCollection.js
- /var/www/dev-events/node_modules/laravel-mix/src/tasks/ConcatenateFilesTask.js
- /var/www/dev-events/node_modules/laravel-mix/src/components/Combine.js
- /var/www/dev-events/node_modules/laravel-mix/src/components/ComponentRegistrar.js
- /var/www/dev-events/node_modules/laravel-mix/src/Mix.js
- /var/www/dev-events/node_modules/laravel-mix/setup/webpack.config.js
- /var/www/dev-events/node_modules/webpack-cli/lib/webpack-cli.js
- /var/www/dev-events/node_modules/webpack-cli/lib/bootstrap.js
- /var/www/dev-events/node_modules/webpack-cli/bin/cli.js
- /var/www/dev-events/node_modules/webpack/bin/webpack.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
at Function.Module._load (internal/modules/cjs/loader.js:725:27)
at Module.require (internal/modules/cjs/loader.js:952:19)
at require (/var/www/dev-events/node_modules/v8-compile-cache/v8-compile-cache.js:159:20)
at _gensync (/var/www/dev-events/node_modules/#babel/core/lib/gensync-utils/async.js:12:16)
at Object.<anonymous> (/var/www/dev-events/node_modules/#babel/core/lib/gensync-utils/async.js:23:22)
at Module._compile (/var/www/dev-events/node_modules/v8-compile-cache/v8-compile-cache.js:192:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14) {
code: 'MODULE_NOT_FOUND',
requireStack: [
'/var/www/dev-events/node_modules/#babel/core/lib/gensync-utils/async.js',
'/var/www/dev-events/node_modules/#babel/core/lib/config/caching.js',
'/var/www/dev-events/node_modules/#babel/core/lib/config/files/utils.js',
'/var/www/dev-events/node_modules/#babel/core/lib/config/files/package.js',
'/var/www/dev-events/node_modules/#babel/core/lib/config/files/index.js',
'/var/www/dev-events/node_modules/#babel/core/lib/index.js',
'/var/www/dev-events/node_modules/laravel-mix/src/FileCollection.js',
'/var/www/dev-events/node_modules/laravel-mix/src/tasks/ConcatenateFilesTask.js',
'/var/www/dev-events/node_modules/laravel-mix/src/components/Combine.js',
'/var/www/dev-events/node_modules/laravel-mix/src/components/ComponentRegistrar.js',
'/var/www/dev-events/node_modules/laravel-mix/src/Mix.js',
'/var/www/dev-events/node_modules/laravel-mix/setup/webpack.config.js',
'/var/www/dev-events/node_modules/webpack-cli/lib/webpack-cli.js',
'/var/www/dev-events/node_modules/webpack-cli/lib/bootstrap.js',
'/var/www/dev-events/node_modules/webpack-cli/bin/cli.js',
'/var/www/dev-events/node_modules/webpack/bin/webpack.js'
]
}

Can't build vue3+vite sample app in production mode on Windows

I cannot build a newly created vue3+vite app on Windows in production mode, while it works ok in development mode. Below are steps I executed to get an error :
npx create-vite-app test_vue3
cd test_vue3
npm install
npm run build
And the error is :
2020-12-01T21:42:14.689Z vite:config env mode: production
2020-12-01T21:42:14.705Z vite:config env: {}
[vite] Build errored out.
{ Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)
at error (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:5253:30)
at Module.error (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:9821:16)
at tryParse (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:9702:23)
at Module.setSource (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:10128:19)
at ModuleLoader.addModuleSource (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:18289:20)
code: 'PARSE_ERROR',
parserError:
{ SyntaxError: Unexpected token (1:0)
at Object.pp$4.raise (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:15543:13)
at Object.pp.unexpected (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:13235:8)
at Object.pp$3.parseExprAtom (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:14942:10)
at Object.pp$3.parseExprSubscripts (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:14745:19)
at Object.pp$3.parseMaybeUnary (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:14722:17)
at Object.parseMaybeUnary (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:19145:29)
at Object.pp$3.parseExprOps (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:14657:19)
at Object.pp$3.parseMaybeConditional (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:14640:19)
at Object.pp$3.parseMaybeAssign (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:14608:19)
at Object.pp$3.parseExpression (D:\test_vue3\node_modules\rollup\dist\shared\rollup.js:14574:19) pos: 0, loc: Position { line: 1, column: 0 }, raisedAt: 1 },
id: 'D:\\Proj_VUE\\test_vue3\\index.html',
pos: 0,
loc:
{ file: 'D:\\Proj_VUE\\test_vue3\\index.html',
line: 1,
column: 0 },
frame: '1: <!DOCTYPE html>\n ^\n2: <html lang="en">\n3: <head>',
watchFiles: [ 'D:\\Proj_VUE\\test_vue3\\index.html' ] }
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! test_vue3#0.0.0 build: `vite build --debug`
npm ERR! Exit status 1
Is there a way to workaround it somehow ? (I tried it on linux, and it works flawlessly)

test cases are failing in setupFilesAfterEnv mode while it is working fine in setupFiles mode in react with jest + enzyme

I am working on testing react components using jest and enzyme , earlier it was working properly but now when I am testing it is failing all test case when using this
"setupFilesAfterEnv": [
"./utils/jestUtils/setupTests.js"
],
and showing error like
● Test suite failed to run
TypeError: base intrinsic for Date.prototype.getUTCFullYear exists, but the property is not available.
1 | const Enzyme = require('enzyme');
> 2 | const EnzymeAdapter = require('enzyme-adapter-react-16');
| ^
3 |
4 | Enzyme.configure({ adapter: new EnzymeAdapter() });
5 |
at GetIntrinsic (node_modules/es-abstract/GetIntrinsic.js:209:12)
at callBoundIntrinsic (node_modules/es-abstract/helpers/callBound.js:10:18)
at Object.<anonymous> (node_modules/es-abstract/2015/YearFromTime.js:9:23)
at Object.<anonymous> (node_modules/es-abstract/2015/DayWithinYear.js:5:20)
at Object.<anonymous> (node_modules/es-abstract/2015/DateFromTime.js:7:21)
at Object.<anonymous> (node_modules/es-abstract/es2015.js:22:16)
at Object.<anonymous> (node_modules/es-abstract/es6.js:3:18)
at Object.<anonymous> (node_modules/array.prototype.find/index.js:4:10)
at Object.<anonymous> (node_modules/airbnb-prop-types/src/childrenOfType.js:1:1)
at Object.<anonymous> (node_modules/airbnb-prop-types/src/index.js:8:1)
at Object.<anonymous> (node_modules/airbnb-prop-types/index.js:1:1)
at Object.<anonymous> (node_modules/enzyme-adapter-utils/src/createMountWrapper.jsx:3:1)
at Object.<anonymous> (node_modules/enzyme-adapter-utils/src/Utils.js:3:1)
at Object.<anonymous> (node_modules/enzyme-adapter-utils/src/index.js:2:18)
at Object.<anonymous> (node_modules/enzyme-adapter-react-16/build/ReactSixteenAdapter.js:41:27)
at Object.<anonymous> (node_modules/enzyme-adapter-react-16/build/index.js:4:18)
at Object.<anonymous> (utils/jestUtils/setupTests.js:2:23)
at Array.forEach (<anonymous>)
Test Suites: 98 failed, 98 total
Tests: 0 total
Snapshots: 0 total
Time: 44.888s
Ran all test suites.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! ***#1.0.0 test: `jest --verbose --colors`
npm ERR! Exit status 1
but when I am changing it to
"setupFiles": [
"./utils/jestUtils/setupTests.js"
],
it is working fine and all the the test case are passed

Problem solved by deleting node_modules & package-lock.json file & reinstalling it by npm install

How do I update my Heroku app without "Application Error"

This is the result when I open the app in heroku after doing an update.
Application error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail
This was the procedure I did when doing the updates:
heroku login
heroku info
heroku git:remote --app tcwhais
git add .
git commit -m "first update"
git heroku push master
heroku open
Because the web did not open, I did the following:
I installed the Heroku CLI (64-bit)
heroku login
heroku git:clone -a tcwhais
cd tcwhais
git add .
git commit -am"to correct error"
git push heroku master
heroku open
This is the logs of the updates:
PS C:\Users\User\Desktop\mysite\INO_TCWHAIS> heroku open
PS C:\Users\User\Desktop\mysite\INO_TCWHAIS> heroku logs --tail
2019-11-12T03:06:57.573596+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 129, in init_process
2019-11-12T03:06:57.573598+00:00 app[web.1]: self.load_wsgi()
2019-11-12T03:06:57.573600+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-11-12T03:06:57.573602+00:00 app[web.1]: self.wsgi = self.app.wsgi()
2019-11-12T03:06:57.573605+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
2019-11-12T03:06:57.573607+00:00 app[web.1]: self.callable = self.load()
2019-11-12T03:06:57.573609+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
2019-11-12T03:06:57.573610+00:00 app[web.1]: return self.load_wsgiapp()
2019-11-12T03:06:57.573612+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
2019-11-12T03:06:57.573614+00:00 app[web.1]: return util.import_app(self.app_uri)
2019-11-12T03:06:57.573616+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/util.py", line 350, in import_app
2019-11-12T03:06:57.573618+00:00 app[web.1]: __import__(module)
2019-11-12T03:06:57.573620+00:00 app[web.1]: File "/app/app.py", line 7, in <module>
2019-11-12T03:06:57.573622+00:00 app[web.1]: import script1
2019-11-12T03:06:57.573624+00:00 app[web.1]: File "/app/script1.py", line 145, in <module>
2019-11-12T03:06:57.573625+00:00 app[web.1]: import requests
2019-11-12T03:06:57.573627+00:00 app[web.1]: ModuleNotFoundError: No module named 'requests'
2019-11-12T03:06:57.574274+00:00 app[web.1]: [2019-11-12 11:06:57 +0800] [10] [INFO] Worker exiting (pid: 10)
2019-11-12T03:06:57.582439+00:00 app[web.1]: [2019-11-12 11:06:57 +0800] [11] [ERROR] Exception in worker process
2019-11-12T03:06:57.582460+00:00 app[web.1]: Traceback (most recent call last):
2019-11-12T03:06:57.582463+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
2019-11-12T03:06:57.582466+00:00 app[web.1]: worker.init_process()
2019-11-12T03:06:57.582470+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 129, in init_process
2019-11-12T03:06:57.582472+00:00 app[web.1]: self.load_wsgi()
2019-11-12T03:06:57.582474+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-11-12T03:06:57.582476+00:00 app[web.1]: self.wsgi = self.app.wsgi()
2019-11-12T03:06:57.582478+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
2019-11-12T03:06:57.582480+00:00 app[web.1]: self.callable = self.load()
2019-11-12T03:06:57.582482+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
2019-11-12T03:06:57.582484+00:00 app[web.1]: return self.load_wsgiapp()
2019-11-12T03:06:57.582486+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
2019-11-12T03:06:57.582488+00:00 app[web.1]: return util.import_app(self.app_uri)
2019-11-12T03:06:57.582489+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/util.py", line 350, in import_app
2019-11-12T03:06:57.582491+00:00 app[web.1]: __import__(module)
2019-11-12T03:06:57.582493+00:00 app[web.1]: File "/app/app.py", line 7, in <module>
2019-11-12T03:06:57.582495+00:00 app[web.1]: import script1
2019-11-12T03:06:57.582497+00:00 app[web.1]: File "/app/script1.py", line 145, in <module>
2019-11-12T03:06:57.582499+00:00 app[web.1]: import requests
2019-11-12T03:06:57.582506+00:00 app[web.1]: ModuleNotFoundError: No module named 'requests'
2019-11-12T03:06:57.583535+00:00 app[web.1]: [2019-11-12 11:06:57 +0800] [11] [INFO] Worker exiting (pid: 11)
2019-11-12T03:06:57.817914+00:00 app[web.1]: [2019-11-12 11:06:57 +0800] [4] [INFO] Shutting down: Master
2019-11-12T03:06:57.818030+00:00 app[web.1]: [2019-11-12 11:06:57 +0800] [4] [INFO] Reason: Worker failed to boot.
2019-11-12T03:06:57.911942+00:00 heroku[web.1]: State changed from up to crashed
2019-11-12T03:06:57.915850+00:00 heroku[web.1]: State changed from crashed to starting
2019-11-12T03:06:57.888899+00:00 heroku[web.1]: Process exited with status 3
2019-11-12T03:07:06.422412+00:00 heroku[web.1]: Starting process with command `gunicorn app:app`
2019-11-12T03:07:09.884688+00:00 heroku[web.1]: State changed from starting to up
2019-11-12T03:07:09.434491+00:00 app[web.1]: [2019-11-12 11:07:09 +0800] [4] [INFO] Starting gunicorn 19.9.0
2019-11-12T03:07:09.435332+00:00 app[web.1]: [2019-11-12 11:07:09 +0800] [4] [INFO] Listening at: http://0.0.0.0:13556 (4)
2019-11-12T03:07:09.435513+00:00 app[web.1]: [2019-11-12 11:07:09 +0800] [4] [INFO] Using worker: sync
2019-11-12T03:07:09.440985+00:00 app[web.1]: [2019-11-12 11:07:09 +0800] [10] [INFO] Booting worker with pid: 10
2019-11-12T03:07:09.470380+00:00 app[web.1]: [2019-11-12 11:07:09 +0800] [11] [INFO] Booting worker with pid: 11
2019-11-12T03:07:16.486361+00:00 app[web.1]: [2019-11-12 11:07:16 +0800] [11] [ERROR] Exception in worker process
2019-11-12T03:07:16.486392+00:00 app[web.1]: Traceback (most recent call last):
2019-11-12T03:07:16.486396+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
2019-11-12T03:07:16.486399+00:00 app[web.1]: worker.init_process()
2019-11-12T03:07:16.486401+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 129, in init_process
2019-11-12T03:07:16.486403+00:00 app[web.1]: self.load_wsgi()
2019-11-12T03:07:16.486450+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-11-12T03:07:16.486452+00:00 app[web.1]: self.wsgi = self.app.wsg
2019-11-12T03:07:16.486450+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-11-12T03:07:16.486452+00:00 app[web.1]: self.wsgi = self.app.wsgi()
2019-11-12T03:07:16.486456+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
2019-11-12T03:07:16.486458+00:00 app[web.1]: self.callable = self.load()
2019-11-12T03:07:16.486460+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
2019-11-12T03:07:16.486462+00:00 app[web.1]: return self.load_wsgiapp()
2019-11-12T03:07:16.486464+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
2019-11-12T03:07:16.486467+00:00 app[web.1]: return util.import_app(self.app_uri)
2019-11-12T03:07:16.486469+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/util.py", line 350, in import_app
2019-11-12T03:07:16.486471+00:00 app[web.1]: __import__(module)
2019-11-12T03:07:16.486473+00:00 app[web.1]: File "/app/app.py", line 7, in <module>
2019-11-12T03:07:16.486475+00:00 app[web.1]: import script1
2019-11-12T03:07:16.486477+00:00 app[web.1]: File "/app/script1.py", line 145, in <module>
2019-11-12T03:07:16.486479+00:00 app[web.1]: import requests
2019-11-12T03:07:16.486491+00:00 app[web.1]: ModuleNotFoundError: No module named 'requests'
2019-11-12T03:07:16.487443+00:00 app[web.1]: [2019-11-12 11:07:16 +0800] [11] [INFO] Worker exiting (pid: 11)
2019-11-12T03:07:16.512372+00:00 app[web.1]: [2019-11-12 11:07:16 +0800] [10] [ERROR] Exception in worker process
2019-11-12T03:07:16.512383+00:00 app[web.1]: Traceback (most recent call last):
2019-11-12T03:07:16.512385+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/arbiter.py", line 583, in spawn_worker
2019-11-12T03:07:16.512388+00:00 app[web.1]: worker.init_process()
2019-11-12T03:07:16.512390+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 129, in init_process
2019-11-12T03:07:16.512392+00:00 app[web.1]: self.load_wsgi()
2019-11-12T03:07:16.512394+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/base.py", line 138, in load_wsgi
2019-11-12T03:07:16.512396+00:00 app[web.1]: self.wsgi = self.app.wsgi()
2019-11-12T03:07:16.512399+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/base.py", line 67, in wsgi
2019-11-12T03:07:16.512401+00:00 app[web.1]: self.callable = self.load()
2019-11-12T03:07:16.512404+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 52, in load
2019-11-12T03:07:16.512406+00:00 app[web.1]: return self.load_wsgiapp()
2019-11-12T03:07:16.512408+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/app/wsgiapp.py", line 41, in load_wsgiapp
2019-11-12T03:07:16.512410+00:00 app[web.1]: return util.import_app(self.app_uri)
2019-11-12T03:07:16.512412+00:00 app[web.1]: File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/util.py", line 350, in import_app
2019-11-12T03:07:16.512414+00:00 app[web.1]: __import__(module)
2019-11-12T03:07:16.512416+00:00 app[web.1]: File "/app/app.py", line 7, in <module>
2019-11-12T03:07:16.512418+00:00 app[web.1]: import script1
2019-11-12T03:07:16.512420+00:00 app[web.1]: File "/app/script1.py", line 145, in <module>
2019-11-12T03:07:16.512423+00:00 app[web.1]: import requests
2019-11-12T03:07:16.512434+00:00 app[web.1]: ModuleNotFoundError: No module named 'requests'
2019-11-12T03:07:16.513594+00:00 app[web.1]: [2019-11-12 11:07:16 +0800] [10] [INFO] Worker exiting (pid: 10)
2019-11-12T03:07:16.819875+00:00 app[web.1]: [2019-11-12 11:07:16 +0800] [4] [INFO] Shutting down: Master
2019-11-12T03:07:16.820089+00:00 app[web.1]: [2019-11-12 11:07:16 +0800] [4] [INFO] Reason: Worker failed to boot.
2019-11-12T03:07:16.959707+00:00 heroku[web.1]: State changed from up to crashed
2019-11-12T03:07:16.939371+00:00 heroku[web.1]: Process exited with status 3
How can I solve this problem?

Codeigniter mkdir: Permission denied error

How to resolve these errors?
A PHP Error was encountered
Severity: Warning
Message: mkdir(): Permission denied
Filename: drivers/Session_files_driver.php
Line Number: 136
Backtrace:
File: /var/www/html/application/controllers/Home.php
Line: 8
Function: __construct
File: /var/www/html/index.php
Line: 315
Function: require_once
Warning: Uncaught Exception: Session: Configured save path '/var/www/html/application/cache/session' is not a directory, doesn't exist or cannot be created. in /var/www/html/system/libraries/Session/drivers/Session_files_driver.php:138 Stack trace: #0 [internal function]: CI_Session_files_driver->open('/var/www/html/a...', 'ci_session') #1 /var/www/html/system/libraries/Session/Session.php(143): session_start() #2 /var/www/html/system/core/Loader.php(1281): CI_Session->__construct() #3 /var/www/html/system/core/Loader.php(1174): CI_Loader->_ci_init_library('Session', 'CI_', NULL, 'session') #4 /var/www/html/system/core/Loader.php(1037): CI_Loader->_ci_load_stock_library('Session', 'Session/', NULL, NULL) #5 /var/www/html/system/core/Loader.php(1082): CI_Loader->_ci_load_library('Session', NULL, NULL) #6 /var/www/html/system/core/Loader.php(218): CI_Loader->_ci_load_library('Session', NULL, NULL) #7 /var/www/html/system/core/Loader.php(202): CI_Loader->library('session', NULL) #8 /var/www/html/system/core/Loader.php(13 in /var/www/html/system/libraries/Session/drivers/Session_files_driver.php on line 138
Fatal error: session_start(): Failed to initialize storage module: user (path: /var/www/html/application/cache/session) in /var/www/html/system/libraries/Session/Session.php on line 143
A PHP Error was encountered
Severity: Error
Message: session_start(): Failed to initialize storage module: user (path: /var/www/html/application/cache/session)
Filename: Session/Session.php
Line Number: 143
Backtrace:

if you're using an apache2-Webserver, check the directory permissions for /var/www/html/application/cache/session. It has to be legible and writable for www-data user.
To set the permissions, simply run sudo chown -R www-data /var/www/html and sudo chmod -R u+rw /var/www/html. This sets the directory permissions recursively to your webroot and all subdirectories.

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