Hi Suryanarayana,

http://www.gromacs.org/Documentation/Errors is where i'd start. But to help you along this error suggests that you have a different number of atoms in your coordinate file(.gro) than your topology(.top) suggests. Often this can be caused by adding or removing ions or solvent without modifying your .top file.

Regards,
Dylan Smith

On 2012-05-22 15:03, Seera Suryanarayana wrote:
Dear all gromacs users,
                                 I tried the
grompp and i got the following error.

Fatal error:
number of coordinates in coordinate file (1UZ9_ion.gro, 41103)
             does not match topology (1UZ9.top, 41100)

Is there any explanation why is thid happening?

I would appreciate any help. Iam new in using MD and gromac in particular.

Suryanarayana Seera,
PhD student,
Hyderabad,
India.

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