ERROR: Unknown angle style (../force.cpp:443)

Dear Lammps experts,

I have recently installed LAMMPS directly from the developer and all the packages ( i.e. USER-MISC, USER-MOLECULE and etc. ) were installed and compiled. But I am getting an error as shown below. I would really appreciate any feedback to resolve this issue.

Thanks in advance

Sarah Lee.

: ERROR: Unknown angle style (…/force.cpp:443)

I think you’re trying to specify an angle sub-style for the hybrid style called class2 that doesn’t exist in those packages.

Apparently not all required packages. You have an unknown angle style error and you have two angle styles listed: class2 and harmonic. Why not look at the bottom of each of the two doc pages and see which additional package you need to install?

Best regards,