[TYPO3-dam] Problem - "The current selection doesn't give a result. No records found."

[Michel LEFRANC]

Hi,
-- I just joined your list. Hope I won't be out of the subject. If so, 
sorry for the noise. --
I just installed the DAM extension, so that I can use the "Content/DAM 
reference usage" (dam_ttcontent).
But when I go to the "Media | List" or "Media | Info", I always get the 
following message:
"The current selection doesn't give a result. No records found."
Whatever I do, I can't get anything else.
Did I miss something?
The installation process seemed to be OK...
Thanks in advance for your help.
Michel