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Geostatic problem in Abaqus

Submitted by Salman on
Dear collegues,
I am doing  consolidation problem for saturated 1 m clay layer with 6 m sand layer above.
ABAQUS is used.
 
The model of soil - Cam-Clay. 
Initial stresses in the soil are given. 
The initial pore pressure as well set. 
Material data is fully specified. 
I just keep getting the following error message:
The sum of initial pressue and elastic tensile strength for the porous elastic material in element 1 instance part-1 must be positive.
Would you advise what can I do to solve this issue.