Unity implementation in Swift 3 project: Crash on application launch - MetadataCache :: Initialize ()

Hi fellow programmers,

I need to implement the exported Unity project into my own Swift project, so I followed the instructions in this tutorial:

https://github.com/blitzagency/ios-unity5

Unfortunately, the app starts when the app starts. I took a screenshot of my debug navigator:

I found this thread and followed every advice, but I cannot get it to work. I would be very happy to see a working example:

https://forum.unity3d.com/threads/il2cpp-anyone-else-seeing-metadatacache-initialize-crashes-sometimes-when-the-game-starts.383145/

Thanks in advance.