VR Pawn convertion from BP to C++ won't to work..

Hello !

The C++ version of VRPawn BP on Beginplay field is not working in my case, i use 5.4.4, it compiles correctly. but when game starts it reads Beginplay and the line according to SetTrackingOrigin make the game crash and quit…

Self-explained image attached.

LanzarComando is a function defined outside, it points to Exec(UObject*, TCHAR*)

Any idea?
Thanks in advance…