What's wrong with my blueprint?

Thank you!
now i only get a warning that says
‘2DSide Scroller Character’ does not inherit from ‘Player Controller’ ( Cast To 2DSideScrollerCharacter would always fail).

how do i fix that too and btw what’s the difference between GetContoller and GetPlayerController why with the one way it’s wrong but with the other is correct? (learning the inside mechs making it easier to learn something so, explaining is the best)