txs error called


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I am attempting to run a geometry optimization on a large system of 170 Au atoms using an ECP. I have recently compiled nwchem, and all works fine when optimizing the geometries of small molecules. When I attempt to run the geometry optimization of this large gold system, however, I get the following error:

                                 NWChem DFT Module
                                 -----------------


                  geometry optimization for a 170-atom gold slab




 Summary of "ao basis" -> "ao basis" (cartesian)
 ------------------------------------------------------------------------------
       Tag                 Description            Shells   Functions and Types
 ---------------- ------------------------------  ------  ---------------------
 Au                      user specified             11       27   6s3p2d


      Symmetry analysis of basis
      --------------------------

        a1g      4590
        a1u      4590
        a2g      4590
        a2u      4590
        eg      18360
        eu      18360

 integer overflow,needed               269292 available               190000
  error found
  error found
 ------------------------------------------------------------------------
 texas: txs_error called                   0
 ------------------------------------------------------------------------


What is the source of this error?

Any advice on how to resolve this would be greatly appreciated.