Fixing My Project: 0KB Assets?

Currently I am experiencing issues with my UE4 Project, which is a college project that will allow me to pass my course. I currently have an issue where the level will load up to 45%, then crash. I went into the logs, and it said numerous items were of 0KB, and Im not sure what I can do to fix it.

Any ideas? It would be a great help, otherwise I may have to start the whole project again, with a very limited amount of time to do it.
I can post screenshots if anyone wants them.
Thanks In Advance!