add callback event /hou.nodeEventType error

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I wanna make a python callback in a Houdini OTL.
here is the code embed in the Python Module Section:

import hou
node = hou.node(“/obj/mySOP”)
def setUpCallback(node):
node.addEventCallback(hou.nodeEventType.ChildCreated, onNodeChange)

def onNodeChange(**kwargs):
if kwargs == hou.nodeEventType.ChildCreated:
print kwargs


however, every time I run the setUpCallback(node) the error message pop out:


File “/home/prisms/builder-new/Nightly11.0/dev/hfs/houdini/python2.6libs/hou.py”, line 6084, in addEventCallback
return _hou.Node_addEventCallback(*args)
TypeError: in method ‘Node_addEventCallback’, argument 2 of type ‘std::vector<HOM_EnumValue *,std::allocator<HOM_EnumValue * > > const &’


anyone has an idea about this ?
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The method requires a tuple of node event types.
node.addEventCallback( (hou.nodeEventType.ChildCreated, ), onNodeChange)
Graham Thompson, Pipeline Supervisor @ Digital Domain
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fast and correct! thank you Graham
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