[modeller_usage] Mutant script warning message

Hi,

I need some help about the single mutant script. The following is a warning message I found in the log file.

generat_607W> Cannot find params in params file: CHARMM atoms : C UNDF IUPAC atoms : C N Atom indices : 900 902 Residues : GLU PTR

Is this the problem relate to the version of the CHARMM?

Many thanks, Alex