error: 7067 system matrix is zero

Hi all,

I am Naveen,

I am working on fuel cell.

I have done the modeling, the meshing, Bondary and subdomain conditions are appied, But When i give the solve option it initiates for solving but suddenly stops and gives the error message

" error: 7067
System matrix is zero. "


I'd appreciate if any one can help in the above regards,


Regards,
Naveen