How to manipulate HBRVector & HFBTVector

Hi,
I want to manipulate these two types. They seem to be defined as FBVector3 and
FBVector4, but i get an error message that says it is impossible to convert
'ORSDK75_BETA1::FBVector3<tType>' to 'ORSDK75_BETA1::HFBRVector'

My code is : 
HFBRVector lHeadRotation = FBVector3<double>(30,40,50);
mActor->MarkerSet->SetMarkerROffset(kFBHeadNodeId, 0, lHeadRotation);