Ok, so i was going to backup my phone (NEXUS 4) and it got an error so i was in Team win recovery and accidentally erased my whole os and on top of that all my back ups so i got nexus toolkit to try to flash stock and it gave me an error so i did force flash i checked the model and board and what not and it all matched but on the command prompt it had an error loading system .img so i was going back to team win recovery... and it is now gone i get a android guy with a "!" and i need to know how to fix this please