After importing an existing project into RubyMine, I encountered "Rails server launcher wasn't found in the project" when I Run/Edit Configuration.
I've checked this Cannot start the debugger in Rubymine. Rails server launcher wasn't found in project, but deleting the .idea directory and re-open is not helpful.
in the Terminal successfully and the rails server runs. So I guess it's likely a RubyMine related thing.
Essentially, what does rails server launcher mean in RubyMine?