Fatal error message

When I tried to access "Special:SecureHTMLInput" I get the following error message.

"Fatal error: Cannot redeclare wfsecurehtmlextension() in /home/wiki/public_html/w/includes/specials/SpecialSecureHTMLInput.php on line 45".

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--Aramsahai 01:06, 8 May 2010 (UTC)‎10:28, 10 January 2012

I also get an error and have crossed checked everything.

"Fatal error: Call to a member function addMessages() on a non-object in /home/content/42/4737242/html/wiki/extensions/SecureHTML/SecureHTML.php on line 52"

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—The preceding unsigned comment was added by an unknown user on a unknown date.‎10:29, 10 January 2012