Error from potential

LAMMPS LAMMPS Beginners
1

Dear all,
I used pair style hybrid/overlay (11 atom types) as follows:
pair_style hybrid/overlay meam meam eam/alloy
pair_coeff * * meam 1 meam.meamf AlS AlS MgS SiS AlS meam.AlSiMgCuFe AlS NULL NULL AlS MgS NULL SiS AlS NULL NULL NULL
pair_coeff * * FeCuNiMn.eam.alloy NULL Cu Fe NULL NULL Ni NULL NULL NULL NULL NULL
pair_coeff * * meam 2 library.meam C C C C.meam NULL NULL NULL NULL NULL NULL NULL NULL C C C

I got this error message:

pair_style hybrid/overlay meam meam eam/alloy
pair_coeff * * meam 1 meam.meamf AlS AlS MgS SiS AlS meam.AlSiMgCuFe AlS NULL NULL AlS MgS NULL SiS AlS NULL NULL NULL
ERROR: Must not extract the same element (AlS) from MEAM library twice. (src/MEAM/pair_meam.cpp:254)
Last command: pair_coeff * * meam 1 meam.meamf AlS AlS MgS SiS AlS meam.AlSiMgCuFe AlS NULL NULL AlS MgS NULL SiS AlS NULL NULL NULL

I am stimulating nanocutting of Aluminium Alloys with 5 alloy atoms.
I will appreciate any suggestion to get ride off this error please. Thanks

2

The error message is self-explanatory and a careful study of the meam pair style documentation should help you understand it and then resolve it yourself.

However, that would be a wasted effort, because your entire intended force field setup is bogus and cannot produce meaningful results. If you want to model an alloy with EAM or MEAM, you must not use a hybrid pair style since that prohibits the proper calculation of the embedding function (it can only be correctly computed from within each single sub-style). You have to have a single pair style with parameters for all elements.
Not to mention that you should be using hybrid and not hybrid/overlay to avoid double counting and that your setup is missing all the cross-terms between the various sub-styles.