How to move an Actor(Cube] from MRPawn?

#Blueprint
#UE4-26
HI all:

I am trying to use Hololens Voice Control to control a cube, here’s my MRPawn blueprint below

When I link the AddActorWorldOffset target to cube(Actor reference) it always shows a cannot read cube error…but when I delete the cube and make it target self it works fine.

Although it works fine with target self situation, I am moving observer myself…

Could someone help me solve this problem? Thanks a lot!!