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I've been getting this same error when trying to publish one specific page, and found the source of the problem to be related to the "name or email address" section of the "Title area" web part. In my situation, the email account listed here was a generic mailbox for the department, which happened to have an "&" in the name and email address. Removing this account allows me to save the page without error, and re-adding this account will generate the error consistently.