"Nothing to Show" appears when "Ruby SDK and Gems" is selected Follow
I am trying to run my debugger in RubyMine. Previously, it was working fine. Today I tried using it and it gave me an error that said "Rackup script is not found in SDK." I tried editing the configuration and taking a peek at the "project SDK" option from the drop-down. There are no longer any options under that menu.
I went to preferences then "Ruby SDK and Gems" and "nothing to show" is all that appears when I click on it. Previously it listed all my RVM versions.
Anyone know how to fix this? 
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Hello Iris,
that appears to be a known issue (https://youtrack.jetbrains.com/issue/RUBY-28617). Could you please try the following:
1. close the project (or the IDE completely)
2. remove .idea from its root
3. reopen the project and check the Preferences with SDKs again