Just Installed QTPRO and got this when going to my site

Goonx <[email protected]>
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Hi,

I just installed QTPRO a few minutes ago, the admin area and the database seem to work fine, but when i tried to go to my site, the main catalog page i got this

Fatal error: Call to undefined function: tep_output_string() in /home/shop/public_html/catalog/includes/functions/html_output.php on line 81

So basically i cant access my site :)

It's propably (hopefully) an easy fix, can anyone please help ??

Thank you.
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