[TYPO3-dam] error after installation

[Aleksandar Milovac]

Hi everyone,
I'm using T3 v4.0. Just installed DAM extension, and after clicking on a
fileadmin folder under Media>file>list, I get the following error:

Warning: mysql_fetch_row(): supplied argument is not a valid MySQL
result resource in /var/www/typo3_src-4.0/t3lib/class.t3lib_db.php on
line 814

What's wrong?

Greetings,
Aleksandar