FENE bond

I defined atom_style hybrid sphere bond for a bead-spring chain composed of 10 sphere with diameter=0.5 and 9 FENE bond between them and i set bond_coeff 1 30.0 1.2 1.0 1.0.
But faced an error ( bad FENE bond ). I thought value of R0 may make this problem.
So i changed value of R0 in bond_coeff command but this problem was not solved
Please help me

FENE bonds have a maximum length before
the energy term blows up. If you are bonding
2 extended spheroids to each other you have
to insure the FENE params are defined to allow
them to be the right distance apart taking
into account that they are spheroids and
not point particles.