Edit: I have solved my problem by reloading an old version of the projects that could launch and importing the content from the newer version. I have no clue what caused the issue, but if anyone have the same problem, doing what I did might work. The old post is below:
I’ve so far been living with the naïve notion that if a game can be played in the editor, it should also be able to be launched and packaged. I’ve spent a long time making a quite complex project, and just as I am ready to release it on the forums, I find that it can’t be launched. This is my first true UE4 project, so I have little experience with most aspects of the engine, and have found it very difficult to identify what’s gone wrong. I suspect I might have to restart the project, and slowly import the different components, packaging as I go, but this will take a long time. I really hope there is a quicker solution to my problem. Here is a link to the output log from attempting to launch: