Just in case there are some other users as unintelligent as I am.....
When I unpacked the bbb-1.0.0 zip it gave me a folder bbb-1.0.0 and I stupidly dragged that folder to the extensions folder (yes, I did read the instructions several times...). This give you the following screenshot.
Solution is to only drag the bbb folder, not the bbb-1.0.0 folder to the extensions folder. Just in case this comes up with anyone else.
Smart people can ignore everything I just wrote.
