[gmx-users] fatal error in grompp

[roshanak starlight]

Hello
I'm trying to simulate the kalp-15 in dppc from gromacs Tutorial by gromacs-
4.5.5. When I run grompp  with this command : grompp -f minim.mdp -c
dppc128.gro -p topol_dppc.top -o em.tpr
I face whith this error:

Fatal error:
Syntax error - File ffnonbonded.itp, line 1
Last line read:
'[ atomtypes ]'
Invalid order for directive atomtypes

what is the reason ?

And an else question :is it necessary that i chang oplsaa force fileld and
chang in lipid.itp  ?
whit these descriptions:

http://lists.gromacs.org/pipermail/gromacs.org_gmx-users/2006-May/021416.html
http://lists.gromacs.org/pipermail/gromacs.org_gmx-users/2006-August/023587.html
http://lists.gromacs.org/pipermail/gromacs.org_gmx-users/2006-September/023761.html

I dont do it .could that fatal error is this?
pleas guide me .thank you