How do I solve this error (Gem::MissingSpecVersionError) ?

Hello, I need a help.
Below is the error situation.
I’ve removed the old version of sinatura, and since then I’m getting this error.

What should I do?

RubyGem’s documentation says that this error is "Raised when trying to activate a gem, and the gem exists on the system, but not the requested version.” So I would try uninstalling all versions of sequenceserver and reinstall just the latest version.

Also, last I used rvm was 9 years ago so it’s probably unfair to say, but removing rvm and reinstalling things using other alternatives might resolve your issue. I prefer to use ruby-install to install Rubies and use chruby to switch between different versions if need be. You could also look at rbenv.