Primary orbitals are deleted during canonical orthonormaliza

[baharehbamdad]

Dear DALTON people,
I need to do some DF-SAPT(DFT) calculation using SAPT+DALTON. I do not have any problem when I have just a benzene molecule as the first monomer and a water molecule as the second one. But, the difficulty is raised when I enlarge the benzene system in two. the clue that I could obtain from the output file is as the following:
@ Primary orbitals are deleted during canonical orthonormalization
@ because of detected numerical linear dependence.
@ Eigenvalue threshold for num. lin. dep. = 1.00D-06

@ 1 MO components are deleted in symmetry 1
Overlap eigenvalues of the deleted orbitals:
8.62D-07
when I change the threshold to 1.00D-08 in .dal files using ".AO DELETE" keyword, I get some "NaN" in the output file. May I have your help?
The attached file is the output.

Best