The method (event) “Launch” has a parameter SetTargetRotation of type FRotator. If you want to call that method anywhere in your code, that method expects to be given an argument (the value, of type FRotator) for parameter “SetTargetRotation”. The timer does not provide this value, so trying to bind it as event to the timer is rejected. This is what’s called a signature mismatch in Unreal.
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