Asci / active size

When I try to do ASCI calculations for larger active spaces
the program stops with: Q-Chem cannot handle an active space of this size.

Could someone tell me how this estimated by the program?

Using the formula for the number of configurations based on n electrons (nel) and n orbitals (n orb), the program stops even when the number of configurations drops. Is there a fixed limit for nel,norb?strong text

Hello Peter,

Could you provide the output file and send it to If the system is confidential, you may build a smallest structure that can reproduce the error.