i am trying to simulate a single wall nanotube with a 3 site CO2 model. I tried to use the same approach that i have used for one site CO2 and argon interacting with a swnt. But when i am trying to simulate these i am getting an error."ERROR: Insufficient Jacobi rotations for rigid body". what should i do for this? i thought to erase the fix rigid or the bond and angles from the nanotube. But then i thought of this works for one site or for argon why here it doesn't?