Arnold AOV creation error


#1

If i have scene with referenced materials(scene with shaders and shading groups) when i create any AOV(build in or custom), error appear:

# Error: RuntimeError: file /Applications/Autodesk/maya2015/Maya.app/Contents/Frameworks/Python.framework/Versions/Current/lib/python2.7/site-packages/pymel/internal/pmcmds.py line 134: 'CONCRETE_ASG.ai_aov_AOV_1' is not a unique name.  Cannot remove alias. # 

Anybody stuck with this?