Based on the error message from your first post I assume there's no webserver gem (webrick, or puma) installed. It's not installed by default. What you can do is to create a textfile Gemfile.local next to the Gemfile of Redmine and put gem 'puma' in it. Then run bundle install again.
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Redmine - Help: RE: Can not start redmine 6.0.1 server
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