[4.5.1] Cannot Launch Game from editor

I was testing issues with some level loading that were happening during PIE mode, but I cannot seem to launch my game at all. I have tried to resolve the issues using all of the resources at my disposal, but to no avail. This has me rather frustrated, so any help would be great. There is a CDO Constructor: failed to find error that I cannot seem to resolve, as well as some large block of crash text. Log is attached here.

Unfortunately, as this game is being developed as a school project, we do not have the time nor resources to upgrade to 4.7 or beyond. So any fixes will have to remain within the realm of 4.5.1.