Hi

I am trying to optimize a molecule with 20 atoms at CASSCF(4,4)/6-31g(d) level of theory, using Gaussian 09 software. The maximum memory that I have is: %mem= 1300MB. (Windows 10, 64bit)

The job stops with this error:

Out-of-memory error in routine OMatEl (IEnd=     134216735 MxCore=     134216728)

 Use %mem=129MW to provide the minimum amount of memory required to complete this step.

Every time I increase the memory (for example to 130MW), I receive this error message again (with a little more memory requested).

Any suggestion is really appreciated.

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