Hey all,

I'm pretty new to working with the API, and I'm having some trouble
getting an MItDependencyGraph node.   I keep getting the good old
"(kFailure): Unexpected Internal Failure", and I've been scratching my
head for quite a while over it.  Was hoping someone here can publicly
point and laugh at whatever I'm doing wrong here.

This is going to be part of a function that traverses upstream from
all meshes under nodes passed to the function and looks for polySmooth
nodes

WARNING - this will create a new empty scene!

Thanks in advance for the help!!

import maya.OpenMaya as OM
import maya.cmds as MC

MC.file(new=True, force=True)
group = MC.group(em=True, name= "grp")
for i in range(3):
    sphere = MC.polySphere(name='sphere%i' % i)
    MC.parent(sphere, group)

#get an MItSelectionList object with all meshes parented under "grp"
funcArgs = ["grp"]
MC.select(MC.listRelatives(funcArgs, pa=1, ad=1, type='mesh'))
sel = OM.MSelectionList()
OM.MGlobal.getActiveSelectionList(sel)
selIt = OM.MItSelectionList(sel, OM.MFn.kMesh)

#would normally start itering here, but for testing just grab the
first item in the selection list
meshNode = OM.MObject()
selIt.getDependNode(meshNode)

typeFilter = OM.MFn.kPolySmooth
direction = OM.MItDependencyGraph.kUpstream

dgIt = OM.MItDependencyGraph (meshNode, typeFilter, direction)

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