Jessie- iwl3945: could not read microcode: -12

[Markos]

Hi

I just installed Jessie in IBM ThinPad (X60) but when during the boot 
appears on screen the rolling messages:

iwl3945 0000:03:00.0: could not read microcode: -12
iwl3945 0000:03:00.0: firmware: failed to load iwlwifi-3945-2.ucode (-2)
iwl3945 0000:03:00.0: Direct firmware load failed with error -2
iwl3945 0000:03:00.0: Falling back to user helper
...

and does not enter the login screen.

What I should to do?

Thanks,
Markos