[gmx-users] Charge on the protein

[raghuvir at bcpindia.org]

Hello

while executing grompp following message is seen although the .tpr file 
is generated

System has non-zero total charge: -3.000000
   Total charge should normally be an integer

I have used AMBER99SB as the force field to prep the topology to run 
implicit solvent simulation.

How relevant is this.  Or do I change the force field

Regards

Raghuvir