Heroku error: One CLI for webpack must be installed - ruby-on-rails

Question

I'm trying to deploy my ruby on rails app to heroku but I get the following errors: heroku logs. I'm working on Rails 6.0.5.1 and I was able to deploy the app perfectly before, so I don't know what could be wrong. Here is my package.json
{
"name": "proyecto",
"private": true,
"dependencies": {
"#activeadmin/activeadmin": "^2.13.1",
"#popperjs/core": "^2.11.6",
"#rails/actioncable": "^6.0.0",
"#rails/activestorage": "^6.0.0",
"#rails/ujs": "^6.0.0",
"#rails/webpacker": "4.3.0",
"bootstrap": "5.2.2",
"bootstrap-icons": "^1.9.1",
"jquery": "^3.6.1",
"popper.js": "^1.16.1",
"turbolinks": "^5.2.0",
"webpack": "^4.0.0"
},
"version": "0.1.0",
"devDependencies": {
"webpack-cli": "^4.10.0",
"webpack-dev-server": "^4.11.1"
},
"engines": {
"node": "14.20.0"
}
}
I have already tried the following solution I found online: heroku config:set YARN_PRODUCTION=true , but it just creates a run time error because it never stops compiling. I also tried to reinstall webpack-cli but it didn´t solve the problem. At this point I'm not sure if this is the error causing the app to crash or if it's the one that it's after it :
ActionView::Template::Error (Webpacker can't find application in /app/public/packs/manifest.json
:
I also tried to fix that problem comenting the line
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
and the main page charges, but the dropdowns aren't working so It's not a viable solution. Also tried to set
extract_css: true
to false, and it doesn't change anything. I feel like I have tried every solution online and none of it works for me