Behnoush Zare wrote:
Thanks Yanzi,Thanks Mark,
for your very usefull points,

I have another pdb2gmx running on thr protein.pdb with ffgmx force 
filed(matching with lipid.itp).
Also I have removed the including ffG43a1 from the lipid.itp and then running 
grompp. The new errors are:

ERROR 1 [file "popc.itp", line 3]:
  Incorrect number of atomtypes for dihedral (1 instead of 2 or 4)

Fatal error:
Bonded/nonbonded atom type '1' not found!

I have read the chapter 5 of the manual but I dont have any idea about these 
errors.
Could you please tell me what are these errors and what should I do to pass 
this step?

Well, neither do we, because we can't see line 3. However, from memory Table 5.1 or 5.2 will point out the different formats you can use for a dihedral interaction.

I suspect something else is quite badly wrong, however, because line 3 is very early in a file for a dihedral to be being defined.

Mark
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