I have a file path I'm trying to set as the "file" knob of a write file.

wNode['file'].setValue(writePath)

This apparently doesn't work.  It sets the path but gets an error when I 
render. It quicks progresses through the shot then prompts this error.  If I 
copy the filePath and paste into the the "Save As" window, it works.  Ideas?

Here's the Details.

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:/Program Files/Nuke6.3v4/plugins\nukescripts\renderpanel.py", line 8, 
in render_panel
    return nukescripts.showRenderDialog(_list, exceptOnError)
  File "C:/Program Files/Nuke6.3v4/plugins\nukescripts\renderdialog.py", line 
702, in showRenderDialog
    d.run()
  File "C:/Program Files/Nuke6.3v4/plugins\nukescripts\renderdialog.py", line 
236, in run
    nuke.executeMultiple(self._nodeSelection, frame_ranges, views, 
continueOnError = self._continueOnError.value())
RuntimeError: Write1: Can't write, Invalid argument



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