prmtop reading error

From: Stern, Julie (
Date: Sun Jan 02 2005 - 15:35:42 CST

   I ran namd on Lemieux for the very first time and got the following

Info: Using AMBER format force field!
Info: AMBER PARM FILE subtest.prmtop
Info: Exclusions in PARM file will be ignored!
Reading parm file (subtest.prmtop) ...
not equipped to read perturbation prmtop
FATAL ERROR: Failed to read AMBER parm file!

Since my programs worked with my local version of NAMD, does anyone
know what is wrong with my prmtop file and what do they mean by
'perturbation prmtop'?



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