Mohr Coulomb Sand in ABAQUS

[Unsymm = YES] Hi, I am having some issues with the Mohr Coulomb model in ABAQUS. I am doing a simple strip foundation and it works perfectly fine when I use Mohr Coulomb Clay (no friction angle, only cohesion). However, when I tried to change it to sand (friction angle, cohesion close to zero (zero not allowed), the run will be aborted. I tried to make the dilatancy angle to be the same as friction angle to simulate associated flow but it does not work as well. I would greatly appreciate if someone can let me know if I am missing anything here. Thank you!