The Internal Program Error 1420.k.no.ar or similar message can occur when attempting to add, duplicate or remove pages. The error is caused by a rogue navbar state being present on one or more of your web pages.
We recommend submitting a support request and sending us your .web/.xar file (the Xara document that you are designing the website in) to allow us to resolve the error for you at http://support.xara.com
Your .web/.xar file can be found by going to File > Save as in Xara.
Robert Turner
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