1. Open attached project
2. Build to iOS with IL2CPP
3. Add in info.plist new string with name "FacebookAppID" and enter this string: 1622057821405505
4. Add "in-app purchases" capability
5. Enable Objective-C Exceptions
6. Build project and it will crash with error "Could not find class ID 124"

or

1. Open built project in Build folder
2. And it will crash with "Could not find class ID 124"

Workaround: Disable "Strip engine code" in player settings

or

In XCode project > Classes > Native > UnityClassRegistration.cpp add following lines:
void RegisterModule_FlareLayer();
RegisterModule_FlareLayer();