Multiplayer issues with Synchvar

Hello everyone !
I'm trying to do a multiplayer game where your player can climb into a turret and shoot from it. I made the multiplayer part with 2 player, but here is the problem : when my client climb a turret, he calls a [Command] so the transform of the turret gun (which is a child of the turret object) is given to him but it doesn't work !
The console says that my variable isn't set.

- When the client who has the server does it it works
- My variable is noted as a Synchvar

if you need more details just ask.

Thanks for your help !

 

You cannot pass Transform through Command. Only simple type as int, vector, float.. and networkId.