DPlot: Failed to allocate values 0

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3:04:30 PM PST - Mon, Feb 17th 2014

Hi, All

 I am trying to get the charge density cube file for a large number of atoms.

dplot

  LimitXYZ

-7.0 7.0 600

-7.0 8.0 600

-6.0 6.0 500

 spin total

 gaussian

 output chargedensity.cube

end

This first error I met was"DPlot: Failed to allocate grid 0",so I increased the memory. Then I still got the error"DPlot: Failed to allocate values 0". Could anyone please tell me how to fix this problem?
regards
Philip