[gmx-users] Invalid Diherdrals

[Taeho Kim]

Hi,
I got fatal error  " Invalid dihedral type 1000" while doing grompp for PR MD.  I built 80 surfactant molecules (using genconf/genbox) and did MD in vacuum(after EM), but when I added tens of same molecules more, I got the problem.

What does it mean?  Is it invalid structure of molecules?  Or is it related to the distance between two molecules added. 

Thank
Taeho