Ya-Jun Zheng zheng at RETINA.CHEM.PSU.EDU
Tue Mar 31 13:35:32 EST 1992

 I am not fimilar with sybyl, but I use Kollman's force field all the time.
I think the error message says that some of the parameters are not available.
You need to assign those parameters. Or, you need to change the atom type

 Hope this will be helpful to you.

  Ya-Jun Zheng

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