i had similar issue… what i did was to find out which asset blueprint is causing the crash try remember the last blueprint you worked on before it crashed… find the blueprint in explorer copy it out of the project folder and try loading the project again… if it the project loads then copy file back to where you moved it from … my problem was moving files around all the time this causes major issues in unreal engine because it does not copy the files correctly it leaves redirectors so now that the project file is loaded up… right click on the content folder in the content browser and click on fix up redirectors in folder and it should get rid of all the redirectors … save project close it down and restart this worked for me… so i guess moving files around in unreal engine is a no no specials if its a master and you have lots of child blueprints depending on it. oh and make sure you make lots of backups so you can revert…