Ho to get google geocoding working?

Perhaps I am a little bit stupid, but I can’t get the google geododing working.
I’ve read all the threads dealing with geocoding, such as http://drupal.org/node/132541 and http://drupal.org/node/158634 and got the impression that it should work now for the us and Canada and all the countries mentioned in the function google_geocode_country_list in the google.inc.

In admin => module settings => gmap I entered the Google map API key, in admin => module settings => gmap location I enabled the the Google Map API geocoding and in admin => module settings => location I enabled ‘Use a Google Map to set latitude and longitude’ and ‘Enable all available features for locations from the following countries’ for Canada, Ermany and the United States.

When I open the admin => module settings => location => Geocoding options I get the following warnings:

warning: in_array(): Wrong datatype for second argument in …\sites\all\modules\location\location.module on line 438.
warning: in_array(): Wrong datatype for second argument in …\sites\all\modules\location\location.module on line 438.
warning: in_array(): Wrong datatype for second argument in …\sites\all\modules\location\location.module on line 438.

Nothing refers to Google Maps (look at the attached image). I even tried to activate yahoo maps ant put my google maps key into the configuration dialog. But of course this did not work.

What am I doing wrong? Please help!