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I edited the user permissions of one of the child forums to "guests can post replies' to threads (of course after verification through a captcha) 

When try to post a reply to a thread I'm getting an error message stating "There was an error posting your reply: The username you entered already exists. Please enter a different username."

Any solutions ?
Can you please provide a forum URL to check this at? :-)
Hi Katos... please see the error at