Seen in the web: "When your link dies soon after submitting your job there should be a simple error in your input file. 2070 simply means an error, this is not a code for a particular error. The real error is written "and explained a bit" in your log/output file.

Check that file to see what is the real source of error."

Kind regards.

there are similar issue discussed here:

https://www.researchgate.net/post/I_am_new_to_DFT_and_presently_using_Gaussian_09_I_need_help_for_Atoms_outside_the_crystal_and_the_error_message_2070

https://www.researchgate.net/post/how_to_resolve_gaussian03_error_msg_2070

I downloaded your input file and it began normally in both G03 and G09, so there is not an error in your input file. Perhaps since there are so may degrees of freedom and so many basis functions, the calculation is having a hard time converging either in the SCF procedure or in the geometry optimization. Maybe post your output file and we can see exactly where the error occurs.

Mr. Amshumali,

The problem in your file is that you have given M-L covalent bonds as input. In such as cases, you should delete these bonds (by GaussView,for example), remaining only Fe2+ centers in ferrocene fragment. In addition you can add opt=gdiis and iop(5/13=1) as shown in the new input (attachment).

Thanks all for the helpful suggestions

Amshumali