Likely too much computation requirement for a quantum structure program.

Look at your input parameters.

Thank Juan. I have changed nproc(number of processor) to 16 already, and I had same result(error). But I have not changed other parameters yet. So I'm going to change another parameter, for example, memory or disk storage.

I don't think Gaussian can process a macromolecule easily and show the molecular orbitals.

Dr. Shoji Fukunaga

For a trimer of a spinel ferrite we used the visualizations of the molecular orbitals lacking of inversion symmetry, using the Multiwfn program version 3.3.7 by Lu and Chen, 2012 version.

But, I saw the Chemistry researchers using it for bigger clusters, however it was a few years ago & I lack more details.

Kind Regards.

Thank you, Jobin. You are right. Gaussian Couldn't.

Thank you, Pedro. I tried Multiwfn, and I could view molecular orbitals of the macromolecule. It could also make a cubefile.