I have done a search on this error but am having problems all the time. I used A5 and A6 years ago, never had this problem before. I have created levels in A7 extra and A8 free. Everything is fine, i make a level, it works fine, then i save it but when I open it and try and run it, I get this message. I have created large and small levels, same error message. Hope you can help me?