Its not an error message.

The Poser reference manual page 537 states:-

....... then open the Python window to view the Wardrobe Wizard button menu shown below.

(See the page for the image)

The text that you have been posting indicates that you have started the script correctly and it is running. What happens when you follow the next step given in the instructions, namely opening the Python window?

Poser top menu Window > Python Scripts

The text window is not the Python Script window.

By all means please do post a copy of any error messages but so far there have not been any.