I can't create a new workspace in the new snapshot

Status
Fixed
Issue description

This only happens for forge 1.15.2 and 1.14.4. I did not install any plugins.

I could not create a new forge workspace. I can enter all of the settings, but nothing happens when I click the create workspace button. Here is the log:
https://pastebin.com/9ybQiWvH

This only occurred after I deleted my grade cache.

Issue comments

Select for example add-on type and back forge workspace type and it will start to work.

I will fix this in the next snapshot.