Line Trace Is Not Working In 4.12

Development Programming & Scripting
2

bool hit = GetWorld()->LineTraceSingleByChannel(
RV_Hit, //result
this->GetActorLocation() + SourceLocation, //start
this->GetActorLocation() + TargetLocation, //end
ECC_Pawn, //collision channel
RV_TraceParams
);

i had to use this