Suggest avoiding dual posts, but I would keep it out of full screen if you can. Or try another phone if you got one. Could be many different reasons for that error, old phone cannot handle the request properly, cannot handle the software/scripting/rpg maker engine properly. I would like to know what phone/android version you use, hardware spec’s if you know how to find them. If not there are apps that can do it for you. This kind of PC emulation half works on newer android versions, you cannot expect it to work on some old one.
