and i am not sure why. it gives me a pop up box saying there is some kind of a bug. can you help me?

When does this pop up? What does the message say? Can you give some more info which may enable people to help you

Thanks, Rob

it only seems to happen when i am putting in some kind of food stand or small ride. The message does not say much except that there is a bug. no reason then it shuts off.