File "/usr/local/env/chroma_env/lib/python2.7/site-packages/glumpy/window/event.py", line 349, in dispatch_event
if handler(*args):
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daeinteractivityhandler.py", line 212, in on_external_npl
self.scene.external_npl(npl)
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daescene.py", line 119, in external_npl
self.event.external_npl( npl )
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daeevent.py", line 199, in external_npl
self.external_npl_base( npl )
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daeeventbase.py", line 25, in external_npl_base
self.setup_npl(npl)
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daeeventbase.py", line 66, in setup_npl
self.setup_photons( photons )
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daeevent.py", line 213, in setup_photons
self.setup_photons_base( photons )
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daeeventbase.py", line 74, in setup_photons_base
self.dphotons.photons = photons ## this setter triggers propagation
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daephotons.py", line 325, in _set_photons
lastpropagated = self.propagate()
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daephotons.py", line 227, in propagate
self.propagator.interop_propagate( vbo, max_slots=max_slots )
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daephotonspropagator.py", line 205, in interop_propagate
self.propagate( vbo_dev_ptr, max_slots=max_slots)
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daephotonspropagator.py", line 160, in propagate
self.ctx.rng_states,
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daechromacontext.py", line 264, in _get_rng_states
self._rng_states = self.setup_rng_states()
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daechromacontext.py", line 225, in setup_rng_states
seed = self.gpu_seed
File "/usr/local/env/chroma_env/lib/python2.7/site-packages/env/geant4/geometry/collada/g4daeview/daechromacontext.py", line 245, in _get_gpu_seed
assert 0, "use setter first"
AssertionError: use setter first