Heroku Failed To Build -Node - heroku

Question

i'm trying to host my website through heroku, but the build is failing constantly whatever i do.The build works locally, but when i tried to push to heroku i keep getting this
Counting objects: 1324, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (609/609), done.
Writing objects: 100% (1324/1324), 28.24 MiB | 0 bytes/s, done.
Total 1324 (delta 681), reused 1324 (delta 681)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Node.js app detected
remote:
remote: -----> Creating runtime environment
remote:
remote: NPM_CONFIG_LOGLEVEL=error
remote: NODE_VERBOSE=false
remote: NODE_ENV=production
remote: NODE_MODULES_CACHE=true
remote:
remote: -----> Installing binaries
remote: engines.node (package.json): ^10.7
remote: engines.npm (package.json): unspecified (use default)
remote: engines.yarn (package.json): ^1.5
remote:
remote: Resolving node version ^10.7...
remote: Downloading and installing node 10.9.0...
remote: Using default npm version: 6.2.0
remote: Resolving yarn version ^1.5...
remote: Downloading and installing yarn (1.9.4)...
remote: Installed yarn 1.9.4
remote:
remote: -----> Restoring cache
remote: Skipping cache restore (not-found)
remote:
remote: -----> Building dependencies
remote: Installing node modules (yarn.lock)
remote: yarn install v1.9.4
remote: [1/4] Resolving packages...
remote: [2/4] Fetching packages...
remote: warning Pattern ["#types/koa#latest"] is trying to unpack in the same destination "/tmp/yarncache.80EhH/v2/npm-#types/koa-2.0.46-24bc3cd405d10fcde81f876cd8285
b44d4ddc3e9" as pattern ["#types/koa#*","#types/koa#*","#types/koa#*","#types/koa#*","#types/koa#*","#types/koa#*","#types/koa#*","#types/koa#*","#types/koa#*"]. This could
result in non-deterministic behavior, skipping.
remote: warning Pattern ["#types/node#latest"] is trying to unpack in the same destination "/tmp/yarncache.80EhH/v2/npm-#types/node-10.9.2-f0ab8dced5cd6c56b26765e1c0d
9e4fdcc9f2a00" as pattern ["#types/node#*","#types/node#*","#types/node#*","#types/node#*","#types/node#*","#types/node#*","#types/node#*","#types/node#*","#types/node#*","#
types/node#*","#types/node#*","#types/node#*","#types/node#*","#types/node#*","#types/node#*"]. This could result in non-deterministic behavior, skipping.
remote: warning Pattern ["koa-convert#latest"] is trying to unpack in the same destination "/tmp/yarncache.80EhH/v2/npm-koa-convert-1.2.0-da40875df49de0539098d1700b50
820cebcd21d0" as pattern ["koa-convert#^1.2.0"]. This could result in non-deterministic behavior, skipping.
remote: warning Pattern ["qs#latest"] is trying to unpack in the same destination "/tmp/yarncache.80EhH/v2/npm-qs-6.5.2-cb3ae806e8740444584ef154ce8ee98d403f3e36" as p
attern ["qs#^6.4.0"]. This could result in non-deterministic behavior, skipping.
remote: (node:257) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or
Buffer.from() methods instead.
remote: [1/4] Resolving packages...
remote: [2/4] Fetching packages...
remote: error An unexpected error occurred: "ENOENT: no such file or directory, scandir '/tmp/yarncache.80EhH/v2/npm-path-key-2.0.1-411cadb574c5a140d3a4b1910d40d80cc9
f40b40'".
remote: info If you think this is a bug, please open a bug report with the information provided in "/tmp/build_11ee5794ef73ae92c415ea71c412314f/yarn-error.log".
remote: info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
remote:
remote: -----> Build failed
remote:
remote: We're sorry this build is failing! You can troubleshoot common issues here:
remote: https://devcenter.heroku.com/articles/troubleshooting-node-deploys
remote:
remote: If you're stuck, please submit a ticket so we can help:
remote: https://help.heroku.com/
remote:
remote: Love,
remote: Heroku
remote:
remote: ! Push rejected, failed to compile Node.js app.
remote:
remote: ! Push failed
remote: Verifying deploy...
remote:
remote: ! Push rejected to sun-it-solution.
remote:
To https://git.heroku.com/sun-it-solution.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/sun-it-solution.git'
i also tried to run yarn cache clean, removing all node_modules and run yarn install , but still the build fails
i'm stuck here :( i googled some other things too but i cant solve the problem please help