I had a similar error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000220
Not sure if yours is more or less the same issue that I had, but I spent many hours trying to fix it. Finally I came across this forum. Check to see if you have any of your details panels not showing up for any of your inherited components in blueprints. If so, you may have to re-parent or recreate the blueprint otherwise your components will be null and might throw a null pointer exception if not caught or checked. It seems to be caused by adding a component in the cpp file after the fact that you parented a blueprint class to that file. Not sure if its the same issue your having but its worth a try since it fixed my error. Also, this may help someone else.