Move an Actor in Editor with code?

Development Programming & Scripting C++
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1

Heya, i am trying to move an AActor around in the Editor using c++, from another thread.

I get my Actor, and try the usual:

FRotator Rot(34, 54, 76);
Actor->SetActorRelativeRotation(Rot, false);

But it hits a breakpoint in (of all places) String.cpp: here:

// First try to print to a stack allocated location 
	GET_VARARGS_RESULT( Buffer, BufferSize, BufferSize-1, Fmt, Fmt, Result );

How can I get this working?

Thanks!