ABAQUS error

Hello 
I do geostatic step for fully saturated soil.

ABAQUS is used.

The model of soil is Modified Cam-Clay along with Porous elastic

Initial effective stresses in the soil are given.

The program displays an error message:

"The sum of initial pressure and elastic tensile strength for the porous elastic material in element 1 embankment must be positive"

can anyone knows the reason of the message? and How can fix it?

Thanks