Hey! 

If I let run my simulation in Abaqus, i always get the warnings: "No output variables associated with this field output group." and "Solver problem. Numerical singularity when processing node". I'm running a simulation to investigate the influence of moisture on a wooden block. Moisture changes are given by amplitudes and the material model is create in a UMAT. 

How could i find out, which field output group has no output variables? 

How could I solve the singularities? I tried to optimize the Boundary condition and the loads, nothing worked. 

Thanks.