ReaxFF run problem

Dear LAMMPS users,

I have a problem with runnig examples with ReaxFF potential.
I want to check ReaxFF potential to make my calculations, but I can’t even run example.
When I try to run example files in.reax.rdx or in.reax.tabt which lie in the /examples/reax/
I get the message ERROR: Invalid pair style (force.cpp.168). I don’t know where I did mistake…

Could you loease help me with my problem?

Thank you.

Dear LAMMPS users,

I have a problem with runnig examples with ReaxFF potential.
I want to check ReaxFF potential to make my calculations, but I can't even
run example.
When I try to run example files in.reax.rdx or in.reax.tabt which lie in the
/examples/reax/
I get the message ERROR: Invalid pair style (force.cpp.168). I don't know
where I did mistake..

you didn't compile lammps with the reax or user-reaxc package installed.

Could you loease help me with my problem?

you need to give yourself a helping hand here
and read through the installation instructions
again, and pay special attention to the parts
about optional packages.

cheers,
   axel.