Help:Errors

XML error: Mismatched tag at line 1XML error: Mismatched tag at line 1

When does it happen: This error appears following a (Save page) from an edit session.
How to avoid it: Always do a (Show preview) before actually saving the page.
What causes this error: A mismatched tag, like a missing closing </scene>, or even a missing "<" or ">" sign.
How to fix it:You must open the page directly in edit mode. For that, try accessing your page (don't pay attention to the XML error text). Now, slightly modify the URL on your browser replacing the / following index.php by ?title= and adding &action=edit after the name of your page. See this example: