ERROR on proc 0: Bond atoms 13 18 missing on proc 0 at step 1

Dear lammps users,

i am using lammps to simulate the polymer(polyaniline),
i had build the structure by using Materials Studio.
i generate more number of chains of polymer. and converted it
into lammps data file.if i run only one chain with more repeating unit it is running succesfully.
while running more number of chains
i am getting following error
ERROR on proc 0: Bond atoms 13 18 missing on proc 0 at step 1

can anyone help in regarding this.i can appreciate

thanks