Picnik export fatal error

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Hello,

I have been having trouble editing images with Picnik. After I edit an image and push the "export" button I get the following error:

Fatal error: Cannot redeclare class Zend_Uri_Http in C:\xampp\php\PEAR\Zend\Uri\Http.php on line 726

I have no idea what it means or why it is happening, any help with this issue would be wonderful.

Thanks in advance!

--Danny

Fulbright