[gmx-users] Invalid angle type 0 error during minimization.

[sreelakshmi ramesh]

Dear all,
               i am trying to simulate a double walled cnt in tip4p water
using oplsaa force field.
               first i used
 *g_x2top -f carbon.pdb -o carbon.top*  ( successfully created the topology)
* editconf -f carbon.pdb -o carbon_newbox.gro -c -box 3.41840 3.44350 5.5965
 genbox -cp carbon_newbox.gro -cs tip4p -o out.gro -p  carbon.top (setup the
box adn solvated it)
*

now if i run minimization as
 grompp  -f em.mdp -c out.gro  -o topol.tpr -p carbon.top
it gives me the following error.

*Program grompp, VERSION 4.5.3
Source code file: topdirs.c, line: 97

Fatal error:
Invalid angle type 0
For more information and tips for troubleshooting, please check the GROMACS
website at http://www.gromacs.org/Documentation/Errors

i had included the .itp file in topology file.any suggestions please.

regards,
sree.
*
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