Hello, 

I have written a VUSDFLD subroutine to modify the conventional Mohr Coulomb model available in ABAQUS. But during the debugging process that is "abaqus job=job-1 user=MMC interactive", I am getting error:

 For contact pairs that are not tied, unresolved initial
           overclosures will result in initial accelerations on the order of
           the penetration distance divided by the time increment squared,
           which can lead to significant mesh distortion. These overclosures
           can be avoided by user adjustment of the mesh.
 Maximum overclosure between surface ASSEMBLY_PILE-1_MASTER and surface
 ASSEMBLY_soil pile cut_SLAVE is 1.45663E-08.

please help me regarding the same.