Travis CI not finding my app - heroku

I have been trying to figure out this error message I keep getting in TravisCI.
The build is set up to deploy to heroku, but it doesn't work. Any thoughts?

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Heroku app shows up for a while and then gives `Application error`

I have created a MERN app and deployed it on Heroku But it works for a while and then gives Application error. However, the code is fine and on the localhost both the frontend and the backend with MongoDB work perfectly fine and are up and running. I have tried everything I found on the internet. Here's the list of things I've done:
Added the config vars on Heroku (in case someone thinks I forgot that)
Checked the Procfile whether there's any space error
Checked the package.json files and scripts
Tried to update the node_modules and restart Heroku
Made commits and tried to push on Heroku multiple times hoping it was a temporary error
But nothing seems to be working and it's still giving H10 errors. What can I try next?

How to properly deploy a Spring Boot Web App on Heroku?

I am trying to deploy my Spring Boot Web application to HEROKU and I am getting the following error:
***> -----> Building on the Heroku-20 stack
-----> Determining which buildpack to use for this app ! No default language could be detected for this app. HINT: This occurs
when Heroku cannot detect the buildpack to use for this application
automatically. See https://devcenter.heroku.com/articles/buildpacks
! Push failed***
I tried setting the build back to heroku/java manually only to also get an error.
The app is built in java so I don't understand what is happening exactly. This is my first time deploying an app online. Any help or guidance will be greatly appriciated
Beppe C. gave me the solution. My pom.xml file was not at the root. I restructured my repo and I got past that error but faced another one.

Kotlin/JS web app doesn't start on Heroku

When I start the app, I get error code H14: no web proccess running.
I've already seen this: Gradle java web app doesn't start on heroku
heroku, and I've tried to run the command, yet I get this error: couldn't find that process type (web).
What is going on?

Building rocket.chat on heroku server faced error

I wanted to deploy the rocket.chat project on heroku, following the deployment instruction, I have encountered the following error:
"
Can't open /tmp/build_29c97eef7e456d21231bc9eb4751ca67/ringelco-racket-chat-a864ad48b50652f34205d656e8e6d93976ce69e3/packages/rocketchat-livechat/plugin/build.sh
/app/tmp/cache/meteor/.meteor/packages/tap_i18n/.1.8.2.10lihy6.24zh++os+web.browser+web.cordova/plugin.tap-i18n-compiler.os/npm/node_modules/meteor/promise/node_modules/meteor-promise/promise_server.js:116
throw error;
"
I have noticed that some other issues are related to such error (this and this), but nobody has answered it yet!
It would be appreciative if you could help me.
Thanks in advance,
Issue fixed.
I just pulled the latest code from Rocket.Chat.
Followed the step to deploy it on Heroku Rocket.Chat Herokyu Deployment.
You have to use buildpack https://github.com/RocketChat/meteor-buildpack-horse.git.

Heroku Build API can't fetch source code

I'm trying to update my app on heroku using node heroku client, but it fails with the message
Unable to fetch source from: https://my-aws-account.s3.amazonaws.com/source.tar.gz?AWSAccessKeyId=...&Expires=...&Signature=...
The source code gzipped tarball is public and fresh during the deploy.
The node-heroku-client seems to follow build api properly. This error occurs after the build has began.
It seems to be a bug on heroku build servers, but I would like to know if someone else had this problem before...
It's a known issue with at heroku, the upstream provider is working on fix https://status.heroku.com/

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