Expected integer parameter in input script or data file (../improper_cvff.cpp:304)

hi we are trying to simulate a box of an ionic liquid, we are getting an error with the improper coefficients.
this is the error message that we get when we try to run the input file.
Expected integer parameter in input script or data file (…/improper_cvff.cpp:304)

units real atom_style full pair_style lj/cut/coul/cut 10.0 bond_style harmonic angle_style harmonic dihedral_style helix improper_style cvff

the improper coeff look like these

Improper Coeffs 1 0.000000 8.370000 0.000000 2 0.000000 9.200000 0.000000

We are using Lopes-Padua

​which is *obviously* incorrect for improper style cvff.​ just compare to
the documentation, where it mentions the three coeff arguments to be: