error: Non-numeric atom coords - simulation unstable (../domain.cpp:521) with PDLAMMPS

Dear all,
I’m trying to module crack propagation with PDLAMMPS.When I was running a sample test,the error 'Non-numeric atom coords - simulation unstable (…/domain.cpp:521)'appeared.What should I do to fix it?
Thanks in advance.
My in file as follow:

units si
dimension 2
boundary s s p
atom_style peri
atom_modify map array
neighbor 0.000010 bin

lattice sq 0.00005
region box block -0.004425 0.005025 -0.000025 0.003025 -0.000025 0.000025 units box
create_box 3 box
create_atoms 3 box

region left prism 0.000025 0.001025 0.002525 0.003025 INF INF -0.0000 0 0 units box
region right prism 0.001025 0.002025 0.002525 0.003025 INF INF 0.0000 0 0 units box
region 1 prism 0.001025 0.002025 0.002525 0.003025 INF INF -0.0000 0 0 units box
delete_atoms region 1
delete_atoms region left
create_atoms 1 region left
create_atoms 2 region right

region lgt block -0.004425 -0.004325 INF INF INF INF units box
region rgt block 0.004925 0.005025 INF INF INF INF units box

pair_style peri/eps
pair_coeff * * 1.4855e11 8e10 0.000150001 0.005 0 5e8
pair_coeff 1 2 1.4855e11 8e10 0.000049999 0.005 0 5e8
delete_atoms overlap 0.000005 all all
set group all density 7860
set group all volume 1.25e-13

group lgt region lgt
group rgt region rgt

fix 1 all nve
fix 2b lgt addforce 0 -1 0
fix 2c rgt setforce 0 0 NULL
fix end1 all enforce2d

compute 1 all damage/atom
timestep 1.0e-9
thermo 2000
thermo_style custom step temp press vol

dump 1 all custom 500 dump.peri id type x y z c_1
run 100000

Dear all,
I'm trying to module crack propagation with PDLAMMPS.When I was running a
sample test,the error 'Non-numeric atom coords - simulation unstable
(../domain.cpp:521)'appeared.What should I do to fix it?

​this usually results from using a geometry or simulation parameters that
result in unstable time integration. there is no simple single fix. you'll
have to double check all individual settings step by step. the best
approach is usually to start from a simple system/setup and gradually
change it to become more complex.

axel.​