PixelEmpire

So, i looked online, and I wasn't sure about it, so i need help. Me and my dad think it's a corrupted file, but we're not sure. Here's what it says. (btw, it worked GREAT yesterday, but not today for some reason...) Could anyone tell me what happened? (If you ask for a crash report, please also add how to, as i don't have a clue. Never had a problem so i never had to find out how.)