I am working with a pore adsorption in double layered N-doped graphene for a certain gas. The surface size 5x5x1. During the capacity measurement at fixed pressure and temperature with the pore size variation, when it is fixed to 0.355 nm, it gives a message as, "No field has been selected for the structure" just after the pressing Run button. Is it due to the narrower pore size or for any other reason? I am not sure about the reason of the message. Anybody can help me by describing the reasons and the solution?
An advance thanks for all the scientist.