Lots of bugs on IOS use case

I don't know how to explain this but I uploaded a video here:
https://gfycat.com/RealisticRaggedHuman

I get two errors. One is really long and I don't know how to explain it. The other is due to a weird symbol. I don't have abnormal characters in my code or strings.

If needed, I can share some more information about my code.