Hellow how to solve this issue?

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1

ERROR 1 [file glycolipid_posre.itp, line 83]:
Atom index (79) in position_restraints out of bounds (1-78).
This probably means that you have inserted topology section
“position_restraints”
in a part belonging to a different molecule than you intended to.
In that case move the “position_restraints” section to the right molecule.

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2

There is a similar topic here. Try following the advice there to see if it helps Atom index out of bound. It’s important that restraints are included in the correct place.