driver cart pmat error for geometry optimization of large system

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I am attempting a geometry optimization of a slab consisting of 170 gold atoms. Towards the beginning of the run, I get the following error:

                           NWChem Geometry Optimization
                           ----------------------------




                  geometry optimization for a 170-atom gold slab


 maximum gradient threshold         (gmax) =   0.004500
 rms gradient threshold             (grms) =   0.003000
 maximum cartesian step threshold   (xmax) =   0.018000
 rms cartesian step threshold       (xrms) =   0.012000
 fixed trust radius                (trust) =   0.300000
 maximum step size to saddle      (sadstp) =   0.100000
 energy precision                  (eprec) =   5.0D-06
 maximum number of steps          (nptopt) =  100
 initial hessian option           (inhess) =    0
 line search option               (linopt) =    0
 hessian update option            (modupd) =    1
 saddle point option              (modsad) =    0
 initial eigen-mode to follow     (moddir) =    0
 initial variable to follow       (vardir) =    0
 follow first negative mode     (firstneg) =    T
 apply conjugacy                    (opcg) =    F
 source of zmatrix                         =


          -------------------
          Energy Minimization
          -------------------

 ------------------------------------------------------------------------
 driver_cart_pmat: memory for pmat            37454400
 ------------------------------------------------------------------------
 ------------------------------------------------------------------------
  current input line :
   268: task dft optimize
 ------------------------------------------------------------------------
 ------------------------------------------------------------------------
 There is an error related to the specified geometry
 ------------------------------------------------------------------------
 For more information see the NWChem manual at http://www.nwchem-sw.org/index.php/NWChem_Documentation


Any information on this error and how to resolve it would be greatly appreciated.

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Posts 190
You ran out of memory trying to allocate an array. In this particular case, you need more stack/heap memory (https://github.com/nwchemgit/nwchem/wiki/Memory).


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