[TYPO3-shop] php error when installing tt_products

[Horn Gábor]

Hello,

i installed tt_products version 2.5.2 to typo3 4.1. As soon as i enable 
the extension, FE breaks and the following error message i can see 
(replaced abosulte path to WEB_ROOT_PATH):


Warning: main(PATH_BE_tablelib/class.tx_table_db.php): failed to open 
stream: No such file or directory in 
WEB_ROOT_PATH/website/typo3conf/ext/tt_products/pi1/class.tx_ttproducts_pi1.php 
on line 55

Fatal error: main(): Failed opening required 
'PATH_BE_tablelib/class.tx_table_db.php' 
(include_path='.:/usr/share/php:/usr/share/pear') in 
WEB_ROOT_PATH/website/typo3conf/ext/tt_products/pi1/class.tx_ttproducts_pi1.php 
on line 55

anyboy please help why it is happening? never saw such error before with 
tt_products.

thanks, Gabor Horns