I'm trying to run a PBC calculation of a 16-atom unit cell.

My input is:

#p opt pbepbe/6-31g(d,p) Int(Grid=Ultrafine) pop=regular iop(5/33=1)

I run it on 16 processors and 30GB memory usage.

The run fails immediately with the following error:

XCMicB: NSigBf= 6382 but NBsAll= 5102.

NBsAll too small in XC quadrature.

Error termination via Lnk1e in /export/apps/local/gaussian/g09/l401.exe at Thu Dec 27 23:01:16 2018.

What does this error mean?

What should I do to solve it?

Thanks in advance,

Asaf