I had already sent you a project (aia) via PM with the same problem:
It is obviously not due to the AI2 build server, but to the development environment under which the extension was compiled. Because the problem also arises with my
MyFonts extension and Ulli's
MediaNotification. But @Ulrich_Bien then compiled
MyFonts.java in his environment and the problem no longer occurs.
Maybe @ewpatton can say more about (the reason for) this issue.
MyFonts with Evan's Extension Template. But Taifun doesn't use it, as he told me.