1. Set up web services as per Overview using token authentication and xmlrpc
2. Created a course
3. Created a group in the course = Group ID is 1 (the only group on the system)
4. Go to client test
5. Select token auth hit go
6. Select moodle_group_get_groups, enter token and enter group id (1). Other fields are empty
7. Hit enter.....

exception 'Zend_XmlRpc_Client_FaultException' with message 'Cource or activity not accessible.' in /var/www/moodle2/lib/zend/Zend/XmlRpc/Client.php:370
Stack trace:
#0 /var/www/moodle2/webservice/xmlrpc/locallib.php(72): Zend_XmlRpc_Client->call('moodle_group_ge...', Array)
#1 /var/www/moodle2/admin/webservice/testclient.php(155): webservice_xmlrpc_test_client->simpletest('http://localhos...', 'moodle_group_ge...', Array)
#2

PS. That's not how you spell 'course' either