Reinstall the driver, and not an MS class driver, get it from Xerox.com. Because whatever you have done to the one you have, you are sending Booklets that can't be done, and since you state you can't print test pages, that means you have really broken the one you have.
Status Indicator RAP
016-738 Invalid paper size for PS booklet print.
Perform the steps that follow:
1. Advise the customer to specify the the correct settings that allow booklet printing.
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for posts that resolve your issues. Your feedback counts!Joe Arseneau