Uncaught exception 'apiServiceException' with message 'Error calling GET …'-Collection of common programming errors

I have a small card game for Google+ which needs the visitor’s name, avatar, gender and city.

It works for myself, but in the error_log I see a lot of PHP-exceptions:

[28-Jan-2012 19:06:33] PHP Fatal error:  Uncaught exception 'apiServiceException' with message 'Error calling GET https://www.googleapis.com/plus/v1/people/me?alt=json&key=AIzaSyAgQl0UeNM553PfLnPmP0jTtcJ8ZIQ3q0g: (404) Not Found' in /var/www/html/preferans.de/google/google-api-php-client/src/io/apiREST.php:86
Stack trace:
#0 /var/www/html/preferans.de/google/google-api-php-client/src/io/apiREST.php(56): apiREST::decodeHttpResponse(Object(apiHttpRequest))
#1 /var/www/html/preferans.de/google/google-api-php-client/src/service/apiServiceResource.php(151): apiREST::execute(Object(apiServiceRequest))
#2 /var/www/html/preferans.de/google/google-api-php-client/src/contrib/apiPlusService.php(207): apiServiceResource->__call('get', Array)
#3 /var/www/html/preferans.de/google/index.php(33): PeopleServiceResource->get('me')
#4 {main}
  thrown in /var/www/html/preferans.de/google/google-api-php-client/src/io/apiREST.php on line 86

Here is my script: