I am using DRC, LVS and LPE files in Cadence (available from UMC 0.13u design kit). DRC and LVS are running but when I run Calibre-> PEX (Parasitic Extraction) the following error is generated:

"Undefined layer name parameter: NSD_C"

LPE file has definition rules similar to the following given below:

RESISTANCE SHEET NSD_C [7.00 0] MASK
RESISTANCE SHEET PSD_C [7.00 0] MASK
RESISTANCE SHEET PLY_C [8.00 0] MASK

Does anybody know what's the problem due to and how I can fix it? Thanks!