I just installed AbanteCart and deleted the install directory, but now I'm getting a critical error:

There has been a critical error processing your request - in red...

When I try to go to the admin, I get a Forbidden page.

The log file says:
2015-07-31 18:26:25 - database error:  AbanteCart core v.1.2.3 Error: Could not load database file ! in <b>/homepages/42/d485618988/htdocs/hmd-ac/core/lib/db.php</b> on line <b>45</b>

Any ideas what might be wrong?