Use this code instead as yours uses the wrong quotation marks due to the Epic forum migration:
void ABaseCharacter::GetActorEyesViewPoint(FVector& Location, FRotator& Rotation) const
{
Location = GetMesh()->GetSocketLocation("head");
Rotation = GetActorRotation();
Rotation.Yaw -= GetMesh()->GetSocketTransform("head", RTS_ParentBoneSpace).Rotator().Roll;
}