POVsnap: strange error

Hello everybody

I've been using the POVsnaps runnable many times successfully.
However, in my last 2D shear cell simulations it does not work.

This is the error message I get:

mpirun -np 2 -machinefile hosts.txt mpipython gouge2dbench_MGriffa.py 1 1

Traceback (most recent call last):
  File "gouge2dbench_MGriffa.py", line 237, in <module>
    runSimulation()
  File "gouge2dbench_MGriffa.py", line 220, in runSimulation
    mySim.run()
  File "/home/grm118/granular_media/ESyS_Particle_my_runnables/POVsnaps.py", line 29, in run
    self.snapshot()
  File "/home/grm118/granular_media/ESyS_Particle_my_runnables/POVsnaps.py", line 40, in snapshot
    camera.setLookAt(self.lookAt)
AttributeError: 'POVsnaps' object has no attribute 'lookAt'

The part of code where the POVsnaps runnable is defined and created is the following

# Add a Runnable of type POVsnaps for creating snapshots
        # povcam = POVsnaps(sim = mySim, interval = 100)
        # mySim.addPostTimeStepRunnable(povcam)

which should be the standard way as indicated in the Users Guide.

The text of POVsnaps.py is the following:

from esys.lsm import *
from esys.lsm.util import Vec3, BoundingBox
from esys.lsm.vis import povray

class POVsnaps (Runnable):
        def __init__(self, sim, interval):
                Runnable.__init__(self)
                self.sim = sim
                self.interval = interval
                self.count = 0
        def configure(self, lookAt=Vec3(35.0,60.0,0),camPosn=Vec3(35.0,60.0,0.0),zoomFactor=0.07,imageSize=[800,600]):
                self.lookAt = lookAt
                self.camPosn = camPosn
                self.zoomFactor = zoomFactor
                self.imageSize = imageSize
        def run(self):
                if ((self.sim.getTimeStep() % self.interval) == 0):
                        self.snapshot()
                        self.count += 1
        def snapshot(self):
                pkg = povray
                Scene = pkg.Scene()
                plist = self.sim.getParticleList()
                for pp in plist:
                        povsphere = pkg.Sphere(pp.getPosn(), pp.getRadius())
                        povsphere.apply(pkg.Colors.Red)
                        Scene.add(povsphere)
                camera = Scene.getCamera()
                camera.setLookAt(self.lookAt)
                camera.setPosn(self.camPosn)
                camera.setZoom(self.zoomFactor)
                fname = "2Dfgtest2finalsnap_%.4d.png" % (self.count)
                Scene.render(offScreen=True, interactive=False,fileName=fname,size=self.imageSize)

Is there any problem in my ESyS-Particle Python files ?

Thanks a lot for your help

Best regards

Michele