I fixed another bug in the latest version. If you had a researcher teaching in the training room, you'd always get an error.
This error will not be fixed unless you update to the new editor, open your level and save it again. I decided to upload it before version 0.30 of the game is released. I have attached it to the first post in this thread.
Alternatively, you can open your level file in a text editor and simply add the following line:
#gbv.AbilityThreshold 45 Researcher