crack error

LAMMPS (9 Nov 2011)
  using 1 OpenMP thread(s) per MPI task
# 2d LJ crack simulation
suffix 		omp
package 	omp 4
  reset 4 OpenMP thread(s) per MPI task

dimension	2
boundary	s s p

atom_style	atomic
neighbor	0.3 bin
neigh_modify	delay 5

# create geometry

lattice		hex 0.93
Lattice spacing in x,y,z = 1.11428 1.92998 1.11428
region		box block 0 100 0 40 -0.25 0.25
create_box	5 box
Created orthogonal box = (0 0 -0.278569) to (111.428 77.1994 0.278569)
  2 by 1 by 1 MPI processor grid
create_atoms	1 box
Created 8141 atoms

mass		1 1.0
mass		2 1.0
mass		3 1.0
mass		4 1.0
mass		5 1.0

# LJ potentials

pair_style	lj/cut 2.5
pair_coeff	* * 1.0 1.0 2.5

# define groups

region	        1 block INF INF INF 1.25 INF INF
group		lower region 1
302 atoms in group lower
region		2 block INF INF 38.75 INF INF INF
group		upper region 2
302 atoms in group upper
group		boundary union lower upper
604 atoms in group boundary
group		mobile subtract all boundary
7537 atoms in group mobile

region		leftupper block INF 20 20 INF INF INF
region		leftlower block INF 20 INF 20 INF INF
group		leftupper region leftupper
841 atoms in group leftupper
group		leftlower region leftlower
841 atoms in group leftlower

set		group leftupper type 2
  841 settings made for type
set		group leftlower type 3
  841 settings made for type
set		group lower type 4
  302 settings made for type
set		group upper type 5
  302 settings made for type

# initial velocities

compute	  	new mobile temp
velocity	mobile create 0.01 887723 temp new
velocity	upper set 0.0 0.3 0.0
velocity	mobile ramp vy 0.0 0.3 y 1.25 38.75 sum yes

# fixes

fix		1 all nve
fix		2 boundary setforce NULL 0.0 0.0

# run

timestep	0.003
thermo		200
thermo_modify	temp new
WARNING: Temperature for thermo pressure is not for group all (thermo.cpp:444)

neigh_modify	exclude type 2 3
dump		1 all atom 500 dump.crack
run		5000
Memory usage per processor = 4.14191 Mbytes
Step Temp E_pair E_mol TotEng Press Volume
       0  0.065993465  -0.82409588            0  -0.76300673  0.031875309    8602.1883
     200  0.064745252  -0.82274736            0  -0.76281367 -0.020063462     8638.484
     400  0.067812244  -0.82555545            0  -0.76278268 -0.075979117    8707.7263
     600  0.078034029   -0.8305041            0  -0.75826918 -0.050592471    8763.2825
     800  0.080606303  -0.83157165            0  -0.75695562 -0.0065186427    8817.8896
ERROR: Domain too large for neighbor bins (neighbor.cpp:1398)