UFUNCTION repliation error

Development Programming & Scripting
4

First things first, don’t include UnrealNetwork.h in your header file. Also please remove Engine.h from your header file and replace it with CoreMinimal.h !

Second thing, the correct line is

UFUNCTION(Server, Reliable)
void ReplicatedFunction();

WithValidation is no longer required unless you want to specifially return false. So just ommit it.

In your cpp file, add #include UnrealNetwork.h
and remove the

  bool AMyCharacter::ReplicatedFunction_Validate()
  {
      return true;
  }

This is new in later engines (the non-requirement for WithValidation) and i see you are using 4.24.