[TYPO3-commerce] problem with articles my first intallation

[Luca Colangelo]

I have installer commerce with typo 4.2.2 but i have a problem.

When i click on "news articles",i have this error :

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result
resource in .........public_html/t3lib/class.t3lib_db.php on line 809

Warning: Cannot modify header information - headers already sent by (output
started at .........public_html/t3lib/class.t3lib_db.php:809) in
.......public_html/typo3/template.php on line 632

Why????

Tanks

Luca.