How to connect initial view controller to tab view controller?

I want to use a login scene as the initial view controller and connect it to a tab view controller but keep receiving the following error message: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController tabBar]: unrecognized selector sent to instance 0x7fe85a560fd0'.


How to connect initial view controller to tab view controller?
 
 
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