[gmx-users] Error - please help

[Sarina]

Hello,
I made a coordinate file of an iron complex and I tried to make the .top file by
entering:
g_x2top -f LFe.xyz -o LFE.top 
and the error I got out was:
"Could only find a forcefield type for 66 out of 74 atoms"
where 4 out of those 8 are atoms attached to the metal and the metal itself.  
I found a couple other people posted similar problems and it was suggested to
take a look at the .n2t file but I can't find it and if I were to find it I
wouldn't really know what to do.  Does this sound like a case where I need to
alter that file and, if so, how do I do that?  Or is there a different solution
to my problem?
Thank you in advance!
-Sarina