Eclipse svn commit error: "svn: E200007: CHECKOUT can only be performed on a version resource [at this time]."

I just ran into the following error while trying to commit (a previously working project) in Eclipse Neon:

svn: E200007: Commit failed (details follow):
svn: E200007: Commit failed (details follow):
svn: E200007: CHECKOUT can only be performed on a version resource [at this time].
svn: E175002: CHECKOUT request failed on '/svn/foo/!svn/rvr/1337/trunk/site/bar.example'
svn: E200007: Commit failed (details follow):

Googling around told me that the fix for this is to right click on the project, select Team and then, Refresh/Cleanup. This unfortunately did not work for me. What did was to go to the command line and run svn cleanup within the project directory.

(This was on Linux.)

Hope this helps!