[Typo3-shop] tt_prducts error message in Typo3.7

[Franz Holzinger]

Has anyone installed successfully the tt-products of Typo3.7 under 
Windows 2000?
If have just installed the plugin without using it.

I do not use the shop and have created one single page without content 
and the crcph template.
I get the error message when I want to show the one page:

Fatal error: Cannot redeclare tx_ttproducts::$cObj in 
S:\apachefriends\xampp\htdocs\shop\typo3conf\ext\tt_products\pi\class.tx_ttproducts.php 
on line 84