SC7950 not printing!

[Lovenice]

Hello, I've got a brand new SC7950 RIP, connected with a RN2050.
It prints the Test page and all signals are green.
Anyway, when I send a pdf from my pc, it make a blank master and then a print a strange error signal.
It says: Error: undefined, Offending Command: Vm? and stuff like this.

Any solution?

Thanks