A commented list of common error messages can be found here:

1) https://wongzit.github.io/gaussian-common-errors-and-solutions/

2) https://docs.alliancecan.ca/wiki/Gaussian_error_messages

Dear Prof Massimiliano Arca,

I look into both links, but get the solution.

Increasing the memory also does not solve the problem.

Same error:

**** Warning!!: The smallest beta delta epsilon is 0.61624464D-01

Leave Link 801 at Sun May 19 09:26:23 2024, MaxMem= 26306674688 cpu: 3.0

(Enter /sw/rl9c/gaussian09/d.01/precompiled/g09/l1101.exe)

Using compressed storage, NAtomX= 150.

Will process 151 centers per pass.

L801 often gives error due to excessive mixing of frontier orbitals. You may try several solutions, such as using the alter keyword or inserting IOp(8/11=1) to avoid the calculation to stop. Most probably changing the functional may increase the frontier MO gap and solve the problem. Please also verify not to use an excessive amount of memory.

Dear Prof. Massimiliano Arca,

Thank you for your reply.

I will check and then carry out the calculation as you suggested.