Optistruct Timeout ALARM. OUT File shows no error

Attempting to do a topology optimization. I've tried numerous times to edit and run this model with no success. I went back through the model and checked everything and cannot find anything wrong with it. Every time I run it, Optistruct sits at 0% for ~15 mins and then states:

The amount of memory allocated for the run is 2527 MB.
This run will use out of core processing in the solver.
Timeout ALARM

==== OptiStruct Job completed ====

But there is no result. I then look at the out file to see what errors might have occurred, but there is nothing.