"Sorry, an error occurred" trying to post my first linked reply

I just tried to post my first linked reply to the old forum.

After composing my post, I kept on getting “Sorry, an error occurred” popup and I was returned to the editing screen.

I enabled JavaScript browser console to find out that the server is returning

 422 (Unprocessable Entity)

and it returns a friendly JSON somewhere (which does not get displayed):

 {"action":"create_post","errors":["Title is invalid; try to be a little more descriptive"]}

My title was:

No such property: vcs for class: org.gradle.plugins.ide.idea.model.IdeaProject_Decorated"

then I tried

Solved build issue: "No such property: vcs for class: org.gradle.plugins.ide.idea.model.IdeaProject_Decorated"

and finally:

Solved build issue: "No such property: vcs for class: org.gradle.plugins.ide.idea.model.IdeaProject_Decorated" (need to use ./gradlew)

Sorry to say that, but so far my experience`is pretty discouraging for any useful contribution here…

I have filed an upstream report as well.