Error while loading `decidim-deploy-heroku.gemspec

[ismaelbenslimane]

Hello, I think there is a version problem, because after "bundle exec rails g decidim:deploy:heroku_installer" the local server no longer starts:

rbenv/versions/2.6.3/lib/ruby/gems/2.6.0/gems/bootsnap-1.3.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:50:in `load': decidim-app/config/routes.rb:11: syntax error, unexpected end, expecting end-of-input (SyntaxError)

and when I push on heroku :

remote: Fetching https://github.com/codegram/decidim-deploy-heroku.git
remote:
remote: [!] There was an error while loading decidim-deploy-heroku.gemspec: cannot load such file -- rails/generators
remote: Does it try to require a relative path? That's been removed in Ruby 1.9. Bundler cannot continue.

Is this method always up to date?