Cannot call function inside COMMAND function

Hello everyone,

Since two days, i'm completely stuck on my problem. I have a mage that have to cast a spell. My code work on the "client/host" side but not on the "client only" side. And if a create a "server only" and connect to it as a "client only" the code doesn't work too on the "client only" side. Here's my code, i'm probably missing something...

Here is the code of "FireMageSpellController.cs" (NetworkBehaviour)
Cannot call function inside COMMAND function