[gmx-users] grompp fatal error Unknown bond_atomtype

[Peter Huwe]

Hi Users,

I am experiencing the following fatal error when I try using the
grompp command.

grompp -f mdout.mdp -r conf.gro -p topol.top

.
.
.
-------------------------------------------------------
Program grompp, VERSION 4.0.99-dev-20100409-0045555
Source code file: toppush.c, line: 631

Fatal error:
Unknown bond_atomtype OSL


.
.
.
OSL is defined in the atomtypes.atp file located in the force field
folder that I constructed.  Thus, I do not understand why it is
"unknown."

Does anybody know how to address this error?

Many Thanks,
Peter Huwe