Help! ERROR: Invalid pair style (../force.cpp:175)

Hi!I am moderately frustrated, because i am trying to use the edip potential and
i have the next error, what it is wrong with my script?
I would thank any help.

LAMMPS (30 Aug 2013)
dimension 3
units metal
atom_style atomic
boundary p p p

read_data data.txt
  orthogonal box = (0 0 0) to (48.879 43.448 27.155)
  1 by 1 by 1 MPI processor grid
  2880 atoms
  2880 velocities
newton on

mass 1 28.086
pair_style edip
ERROR: Invalid pair style (../force.cpp:175)

Have you taken a look at the edip doc page? Especially the "Restrictions" part?