When you publish the exe, go into File, Publish Settings on the
Projector tab and check the box for "Display full script error text".
That will make the program give you a more descriptive error message.
Once you know what is going wrong, then we may be able to fix it.

You may want to include a few lines of code, specifically the ones where
the error happens. It is amazing how much better we can help you if you
tell us what is going on. You may need to be a bit more descriptive
about what is a small projector vs a regular projector, of what is the
difference between the different publish options you have chosen.