Error if import avatar on registration

Fatal error: Uncaught exception 'FacebookRestClientException' with message 'An unknown error occurred' in /nfs/c03/h04/mnt/48954/domains/xxxxx.org/html/administrator/components/com_jfbconnect/assets/facebook-api/facebookapi_php5_restlib.php:2458 Stack trace: #0 /nfs/c03/h04/mnt/48954/domains/xxxxx.org/html/administrator/components/com_jfbconnect/assets/facebook-api/facebookapi_php5_restlib.php(1232): FacebookRestClient->call_method('facebook.users....', Array) #1 /nfs/c03/h04/mnt/48954/domains/xxxxxd.org/html/components/com_jfbconnect/helpers/communitybuilderhelper.php(139): FacebookRestClient->users_getInfo('536844210', Array) #2 /nfs/c03/h04/mnt/48954/domains/xxxxx.org/html/components/com_jfbconnect/helpers/communitybuilderhelper.php(49): JFBConnectCommunityBuilderHelper->migrateFBAvatarToCB() #3 /nfs/c03/h04/mnt/48954/domains/xxxxx.org/html/components/com_jfbconnect/controller.php(62): JFBConnectCommunityBuilderHelper->importFBProfile() #4 / in /nfs/c03/h04/mnt/48954/domains/xxxxx.org/html/administrator/components/com_jfbconnect/assets/facebook-api/facebookapi_php5_restlib.php on line 2458