Help! urgent problem

[purdue_vr]

I am not able to execute any file. I get this error msg:

Traceback (most recent call last):
File "<string>", line 0, in ?
AttributeError: type object 'VizNode' has no attribute '_GetObject'
Traceback (most recent call last):
File "<string>", line 0, in ?
AttributeError: type object 'VizView' has no attribute '_GetObject'
Traceback (most recent call last):
File "<string>", line 0, in ?
AttributeError: type object 'VizAudio' has no attribute '_GetObject'
Traceback (most recent call last):
File "<string>", line 1, in ?
File "C:\Program Files\WorldViz\Vizard30\python\viz.py", line 18, in initplugins
pluginPath = getVizardPath() + 'plug-ins\\'
TypeError: unsupported operand type(s) for +: 'int' and 'str'