GromacsError: Structure contains UNL molecules, but no template defined Exiting. All files have been retained.

[imren bayıl]

hi, I want to calculate binding energy for my protein ligand comple struture

but  I am geting this error

GromacsError: Structure contains UNL molecules, but no template defined
Exiting. All files have been retained.

how to fix this error , could yyou help me please

[marioe911116]

There is a mismatch between the topology and the input structure. Please, ake sure that the ligand molecule contains exactly the same name in both the input structure and the topology