Drucker-Prager ANSYS solution not converged

[uwmadison]

Hi all,
Hope someone can help me with the following:
I am trying to model rigid loaded rectangular volume (50m*50m*50m).

I get the following error: solution not converged at time 1.E-02 (load step 1 substep1). Run terminated.

I am using the following: (SI units)
- Element type: Solid185
- Material Model: Linear Isotropic: EX=1.82E+008 PRXY=0.3 density of 1849 Drucker-Prager: c=100 friction angle=38 flow angle=25
- gravity load applied


Constraints:
bottom part is constrained in all directions. The sides are constrained in x and y directions.

I need advice to solve this error?