UWGEO: MaterialRegistry() loading error #751

Hello all,

I am Weiling Zhu, PhD student from Chinese Academy Science University. I am right now using UW2 and UWGeodynamics to model the subduction process.
When I Running:

from underworld import UWGeodynamics as GEO
GEO.MaterialRegistry()

raises:

KeyError: 'Wet_Quartz_Dislocation_Goetze_et_al_1978'

The error occurs while loading the default material database. It seems this rheology is referenced in but missing or mismatched in the rheology registry.

Expected behaviour: MaterialRegistry() should load normally.