uglifier | Ruby wrapper for UglifyJS JavaScript compressor

I have other rails app on this server working fine...
I have nodejs install on my serveur
I have gem 'therubyracer', platforms: :ruby in gemfile,
I try bundle install,
I try config.assets.js_compressor = Uglifier.new(harmony: true) in prod conf

but nothing resolve the bug...

Im running ruby version 2.6.1 with docker. Rake gem is version 13.0.1.
Whenever I tried docker-compose up, it always fails and throws this error everytime:
This error did not exist before.

I'm upgrading rails from 4.2 to 5.0, and I'm getting some mean dependency issues. When I run bundle update i get the following output. The thing is that when i look through the messages, it looks like the gems should be able to install just fine when looking at the version requirements.

I also tried to delete my Gemfile.lock, that didn't help.

Any suggestions would be appreciated.

I am more of a Java programmer and still somewhat new to development (2 years or so, can write Java code & web apps just fine) however the company I work for has 4 Rails applications and was asked to get this application working called CtrlPanel. I have been having to learn Ruby on Rails in order to help get this issue with this app fixed and get it working.

I have been working on this problem for over a week all day long every day and nothing I do is fixing it.

I fixed everything to the point the app comes up, web server runs serves the pages but all views are white screens as long as this application.html.haml file is present. I re-wrote the file with very basic bootstrap and it sort of works but nothing looks right. The problem seems to stem from 1 single like that simply says: = javascript_include_tag "application"

I have been all over the internet and have tried every single fix from changing coffee-script-source to v1.8.0 as I read Windows has an issue with newer rails and that file, I have tried every variation of changing it from application to default, and every type of ending you can think of no matter what I do it gives me this error message which I can not seem to find.

I am not even sure WHAT that line does, I assume it has to do with the new Google Maps API and I verified the key is valid and it was working before.

This is the error is it giving it says the line with "= javascript_include_tag" "application" giving error ExecJS::RuntimeError at / SyntaxError: [stdin]:1:1: unexpected //=

I am running a PC on Windows 10 20H2 x64 UEFI ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x64-mingw32] Rails 6.1.3

(I did also install Ubuntu on another machine and it gives the exact same error, also gives the same error on another Windows machine)

The app is working IF I delete the "application.html.haml" file and put in a skeleton basic version all of the other views start working but of course none of them look right no menus no bootstrap no nothing.
Here is the application.html.haml file.

I'm trying to build a Rails application on Mac OS Big Sur with the following versions ...

I have cloned an existing project and trying to run it in my system. Since this is the first time I don't have any Gemfile.lock file in my directory. I tried running bundle install and the following errors occur:

My app works locally, however when I try to deploy to Heroku, I get a Sprockets::FileNotFound: couldn't find file 'angular' with type 'application/javascript' error.

I have tried precompiling with RAILS_ENV=production bundle exec rake assets:precompile and purging my build cache with heroku builds:cache:purge -a findum, but still no luck. I recently migrated from Bower to Yarn– not sure if my asset path is the problem?

Has anyone run into a similar error that they were able to resolve? So many thanks 🙏.

This is my application.js :

I updated my ruby to 3.0.0 but for some reason now my application doesn't work. I have searched online for different answered but I cannot find anything. This error has gotten me going crazy now. Here is what happens.

When I do bundle update I get:

I'm trying to revive an old Rails application I worked on several years ago. I'm using ruby 2.3.3 and rails 3.2.15 on the Heroku-16 stack with ClearDB for my MySQL database with the mysql2 adapter. When deploying to Heroku it succeeds on the deploy but crashes when it tries to start the app.

Full stack trace from the Heroku log (updated after fixing activerecord-import gem version per suggestion in first answer):