HOT Map does not display

Everything ok but HotMaps still doesn't show the map. It only displays an allert like here:
www.inlignano.it/index.php/contatti
and in the main page
www.inlignano.it
I tried to figure out but didn't find. Under Components menu - Contacts a strange warning message says
Warning
JUser: :_load: Unable to load user with ID: 162

What is the problem?

Hello,

You need API keys for your site for Google Maps. Read and follow this page carefully: www.hotjoomlatemplates.com/blog/376-google-maps-api-key

If the warning disappear after you save this page, then everything is OK. This is due to bug in Joomla upgrade that's fixed in the next version.

Regards,
Milos