mixed potentials use with lammps

dear lammps user's
i ould use tersoff potential as provided with lammps for GaN and morse
potential to descriebe the interaction between Ga-O and N-O
but when i preapared the input files with different pair style and
pair coeff it's not work
so have any one an idea on how to set this
best regards

but when i preapared the input files with different pair style and
pair coeff it's not work

not enough info for anyone to help ...

Does it give an error? What are the pair hybrid commands
you are using?

Steve