"user warning: Table..."

I read the README.txt from start to finish.

I've installed the fb module in the right way (or so I think), but I get this error:

user warning: Table 'x_drupal.fb_app' doesn't exist query: SELECT fba.* FROM fb_app fba in /home/httpd/vhosts/y/httpdocs/drupal/modules/fb/fb_app.module on line 81.

x = my username of the server
y= my website name

When I try to add an application I get the error message "Unable to get application properties. Confirm both apikey and secret"

After an update I still get the error "user warning..."

I'm not very familiar with the logics of PHP.

Thanks for your answer(s).