Error 703

Drom when I was having memory problems, I trimmed down my model by deleting a chunk of elements.  However, when I run the optimization I get the following error after 12 iterations.

 *** ERROR #  703 ***
   number of design variables =     339111
        number of constraints =          3
    error code from optimizer =        900
 The optimizer failed to find a solution of the optimization
 problem at the current iteration.
 This error occurs in module 'appdrv'.

Any ideas?