Abaqus CAE (Solver Problem: Zero Pivot)

Hello all,

I am getting the following error in the model that consists of Coupled Temp-Disp step.

'Solver problem. Zero pivot when processing D.O.F. 2 of 1 nodes'

Does anyone have any idea on how to correct this?

I know it has to do something with the BC but I am NOT sure where I am going wrong.

Any help is appreciated.

Thanks