Tersoff is missing an entry error

Hi,
What is the problem with this error?? There are 6 atom types

pair_style hybrid/overlay lj/class2/coul/long 12 tersoff
pair_modify tail yes
pair_coeff * * lj/class2/coul/long 0.0200000000 2.9950000000
pair_coeff 1 1 lj/class2/coul/long 0.0200000000 2.9950000000
pair_coeff 2 2 lj/class2/coul/long 0.0540000000 4.0100000000
pair_coeff 3 3 lj/class2/coul/long 0.0540000000 4.0100000000
pair_coeff 4 4 lj/class2/coul/long 0.2247000000 3.9200000000
pair_coeff 5 5 lj/class2/coul/long 0.0540000000 4.0100000000
pair_coeff * * tersoff SiC.tersoff Null Null Null Null Null C

ERROR: Potential file is missing an entry (…/pair_tersoff.cpp:529)

tnx,

Hi,
What is the problem with this error?? There are 6 atom types

But Null != NULL

Lammps thinks Null is an element.

Axel