wall/gran problem

Hi everybody

Im currently modifying the movingMesh example to learn how to use Liggghts
Till now I have being able to modify the region geometry, size of particles, particles insertion region, etc

But now I got stuck when I try to apply the wall/gran fix to the stl file that I defined. The program simply crashes.

Does anyone detect where is my mistake?

Here is the scrypt:

atom_style granular
boundary m m m
newton off

communicate single vel yes
units si

#region reg block -.1 0.6 -.1 0.2 -0.3 0.25 units box
region reg cylinder z 0 0 .06 -0.1 .3 units box
create_box 1 reg

neighbor 0.002 bin
neigh_modify delay 0

#Material properties required for new pair styles

fix m1 all property/global youngsModulus peratomtype 5.e6
fix m2 all property/global poissonsRatio peratomtype 0.45
fix m3 all property/global coefficientRestitution peratomtypepair 1 0.9
fix m4 all property/global coefficientFriction peratomtypepair 1 0.05
fix m5 all property/global characteristicVelocity scalar 2.

#New pair style
pair_style gran/hooke/history 1 0 #Hooke without cohesion
pair_coeff * *

timestep 0.00005

fix 1 all nve/sphere
fix 2 all gravity 9.81 vector 0.0 0.0 -1.0

#box walls
fix zwalls all wall/gran/hooke/history 1 0 zplane -0.1 0.3 1
fix cylinder_wall all wall/gran/hooke/history 1 0 zcylinder 0.06 1

#import mesh from cad:
fix cad1 all mesh/gran Paddle3.stl 1 0.001 0 0 250 0 0 0

#particle insertion
region bc cylinder z 0 0 .025 0.01 0.03 units box
group nve_group region reg
fix ins nve_group pour/legacy 1500 1 1 vol 0.5 1000 diam 0.004 0.004 dens 2500 2500 vel 0. 0. 0. 0. -0.8 region bc

#thermo settings
compute 1 all erotate/sphere
thermo_style custom step atoms ke c_1 vol
thermo 1000
thermo_modify lost ignore norm no
compute_modify thermo_temp dynamic yes

#insert the first particles so that dump is not empty
run 1

#make a dump of particles and the stl file
dump dmp all custom 200 post/dump.simula id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
dump dumpstl all stl 200 post/dump*.stl

#run with particle insertion
run 8000 upto
unfix ins

#run to let particle settle
run 29999 upto

#use the imported mesh as granular wall
fix cylinder_wall all wall/gran/hooke/history 1 0 mesh/gran 1 cad1
run 30000 upto