in.peptide example not work

Dear lammps developers,

I tried to run the script in.peptide located in the directory "LAMMPS/examples/peptide" on ubuntu 14.04,
but it tells me an error due to the fix style.

---------------------------- This is the input file "in.peptide" -----------------------------------------------------------------------------------------------

# Solvated 5-mer peptide

units real
atom_style full

pair_style lj/charmm/coul/long 8.0 10.0 10.0
bond_style harmonic
angle_style charmm
dihedral_style charmm
improper_style harmonic
kspace_style pppm 0.0001

read_data data.peptide

neighbor 2.0 bin
neigh_modify delay 5

timestep 2.0

thermo_style multi
thermo 50

fix 1 all nvt temp 275.0 275.0 100.0 tchain 1
fix 2 all shake 0.0001 10 100 b 4 6 8 10 12 14 18 a 31

group peptide type <= 12

#dump 1 peptide atom 10 dump.peptide

#dump 2 peptide image 25 image.*.jpg type type &
# axes yes 0.8 0.02 view 60 -30 bond atom 0.5
#dump_modify 2 pad 3

#dump 3 peptide movie 25 movie.mpg type type &
# axes yes 0.8 0.02 view 60 -30 bond atom 0.5
#dump_modify 3 pad 3

#compute bnd all property/local btype batom1 batom2
#dump 2 peptide local 300 dump.bond index c_bnd[1] c_bnd[2] c_bnd[3]

run 300

----------------------- This is the log file "log.lammps " -------------------------------------------------------------------------------------------------

LAMMPS (28 Jun 2014)
# Solvated 5-mer peptide

units real
atom_style full

pair_style lj/charmm/coul/long 8.0 10.0 10.0
bond_style harmonic
angle_style charmm
dihedral_style charmm
improper_style harmonic
kspace_style pppm 0.0001

read_data data.peptide
  orthogonal box = (36.8402 41.0137 29.7681) to (64.2116 68.3851 57.1395)
  1 by 1 by 1 MPI processor grid
  reading atoms ...
  2004 atoms
  reading velocities ...
  2004 velocities
  scanning bonds ...
  3 = max bonds/atom
  scanning angles ...
  6 = max angles/atom
  scanning dihedrals ...
  14 = max dihedrals/atom
  scanning impropers ...
  1 = max impropers/atom
  reading bonds ...
  1365 bonds
  reading angles ...
  786 angles
  reading dihedrals ...
  207 dihedrals
  reading impropers ...
  12 impropers
  4 = max # of 1-2 neighbors
  7 = max # of 1-3 neighbors
  14 = max # of 1-4 neighbors
  18 = max # of special neighbors

neighbor 2.0 bin
neigh_modify delay 5

timestep 2.0

thermo_style multi
thermo 50

fix 1 all nvt temp 275.0 275.0 100.0 tchain 1
fix 2 all shake 0.0001 10 100 b 4 6 8 10 12 14 18 a 31
ERROR: Invalid fix style (../modify.cpp:731)

Dear lammps developers,

I tried to run the script in.peptide located in the directory "LAMMPS/examples/peptide" on ubuntu 14.04,
but it tells me an error due to the fix style.

[...]

fix 1 all nvt temp 275.0 275.0 100.0 tchain 1
fix 2 all shake 0.0001 10 100 b 4 6 8 10 12 14 18 a 31
ERROR: Invalid fix style (../modify.cpp:731)

-------------------------------------------------------------------------------------------------------------------------

How I can solve this problem?

check your executable (use -h flag) if it contains the shake flag.
most likely, you didn't install the RIGID package before compiling
LAMMPS.

axel.