I'm fairly new to app development and I trying to understanding the reasoning on why the app I'm developing keep crashing/not running. I understand that "libswiftCore.dylib 0x18f70f568 assertionFailure(:_:file:line:flags:) + 304" is responsible for the crash but I don't understand why and how to fix the issue. Any help on this problem will be greatly appreciated. Below contains the crash report. My Crash Report