Loading two files

I want to load two different files one is of sphere packing and second one is geogrid. Then i again want to load same sphere packing so that my system would be - packing then geogrid then packing. Then i want to deposit them under gravity.
My problem is only the latest one uploads rest do not. How to make it up?

Here is my script-
from yade import pack,geom,qt
from yade.gridpfacet import *
from yade import utils
from pylab import *
from pprint import pprint
from yade import plot
from builtins import range
from yade import export

#Load packing from previous script
O.load('packing.yade')
sp = SpherePack()
sp.fromSimulation()
sp = pack.SpherePack([(b.state.pos,b.shape.radius) for b in O.bodies if isinstance (b.shape, Sphere)])
print (len(O.bodies))
#load grid grid.yade
O.load('grid.yade')
#again load packing
O.load('packing.yade')

E=5e6
Poisson=0.3
Density=2650
v=0.05
rm=0.0019
O.engines=[
  ForceResetter(),
  InsertionSortCollider([Bo1_Sphere_Aabb(), Bo1_GridConnection_Aabb()]),
  InteractionLoop([
    Ig2_Sphere_Sphere_ScGeom(),
    Ig2_Sphere_GridConnection_ScGridCoGeom(),
    Ig2_GridNode_GridNode_GridNodeGeom6D(),
    Ig2_GridConnection_GridConnection_GridCoGridCoGeom(),
  ],
  [
    Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=False),
    Ip2_FrictMat_FrictMat_FrictPhys()
  ],
  [
    Law2_ScGeom6D_CohFrictPhys_CohesionMoment(),
    Law2_ScGeom_FrictPhys_CundallStrack(),
    Law2_ScGridCoGeom_FrictPhys_CundallStrack(),
    Law2_GridCoGridCoGeom_FrictPhys_CundallStrack(),
  ]
  ),
  GlobalStiffnessTimeStepper(timestepSafetyCoefficient=0.5,label='ts'),
  NewtonIntegrator(gravity=(0,0,-9.81),damping=.8,label='newton'),
  PyRunner(command='checkUnbalanced()', realPeriod=1, label='checker'),

 ]

O.materials.append( CohFrictMat( young=5e6,poisson=.3,density=2650,frictionAngle=0,normalCohesion=3e100,shearCohesion=3e100,momentRotationLaw=True,label='cohfrictMat' ) )
O.materials.append( FrictMat( young=E,poisson=Poisson,density=Density, frictionAngle=radians(20),label='frictMat' ) )

#Box
O.bodies.append(geom.facetBox((0.05, 0.05, 0.05), (.05, .05, .05), wallMask=31, material='frictMat'))

def checkUnbalanced():
 print('unbalanced force:', unbalancedForce(), 'porosity', utils.porosity())
 if unbalancedForce() > 0.05:
  return
 O.pause()

qt.Controller()
qtv = qt.View()
qtr = qt.Renderer()
qtr.bgColor=[1,1,1]
Gl1_Sphere.stripes=0

O.saveTmp()