I see this with the EzRPG engine, not very much people can program in OO, so there not so many developers for it.
That's the reason i have choosen to not use OO, so many people can use it ;)
Its not that i can not program in OO, but i think on others ;)
My fould there was a error.
I had the error report wrong.
The error has been fixed at the demo version, i will upload a new package for the downloads somewhere this days.
The error came when you did not select any building to rob it.