[SOLVED] Can't change CameraBoom Rotation

I got a book on C++ Using Unreal 4 but about five chapters in, it tells me to add a line of code, specifically,

FollowCamera->SetRelativeLocation(FRotator(-70.0f, 0.0f, 0.0f)); 

except for some reason, I keep getting an error saying "no suitable user-defined conversion from “FRotator” to “FVector” exists. How do I fix this? Because I can’t find anything online about it.

Bump. Need an answer here.

So it turns out I misread it and it actually said set relative rotation, not location. But now I have a new problem. The camera’s always staying behind the player, rather than be above it.