Quantus QRC (PVS interface) error

Hi, 

i'm trying to run Quantus QRC on a block that is LVS and DRC clean, and i get the following error, i don't really know how to solve this error neither where to look to solve it. i would be very gratefull if someone can help with this. 

ERROR (CAPGEN-41397) : blocked layer 'Metal x' is not defined in the process file 

with best regards, 

Reda.