I want to calulate in calss 2 force field but when i run the input file the error invalid pair_style invalid bond_style and other errors i see. plesas help me how to solve this problem . i think i did not install some thing in lammps tha i face with this problems.

thank alot

Dear Ramin,

Please see documentation (errors section and pair_style etc.) and if you still struggle with it, send your data/input files to the mail-list. The errors are due to incorrect format of your file/s. Also, similar question have been raised before. Nobody can help you if they cannot see what you have done.