NLGEOM analysis problem

Dear all

      I am using NLGEOM method to solve a nonlinear problem. I want to use discrete date to define material. And the first (x1,y1) are (0, 310), 310 is the initial yield point.

But when I analysis, there comes a problem. The following shows the problem.

 *** ERROR # 3002 ***
  The first point (X1,Y1) specified on the TABLES1 bulk data entry ID=5
  is not located at the origin of the stress-strain curve.

 

I don't know why, could you help me with that?  The model I used is as follows.  Thanks!

 

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