Private-Messaging

I follow the instructions of Private-Messaging, but I see error as follows:

"Active record "Message" has an invalid configuration for relation "receiver". It must specify the relation type, the related active record class and the foreign key."

My config/main.php:




'message' => array(

                        'userModel' => 'User',

                        'getNameMethod' => 'getFullName',

                        'getSuggestMethod' => 'getSuggest',

                        //'viewPath' => '/message/fancy',

                        

                        'receiverRelation' => array(

                                        CActiveRecord::BELONGS_TO,

                                        'User',

                                        'on' => 'User.id = receiver_id'

                        ),


                        

                                                )


                        'senderRelation' => array(

                                        CActiveRecord::BELONGS_TO,

                                        'User',

                                        'on' => 'User.id = sender_id'

                        ),


                                

        ),



This is my post, it have error "Active record "Message" has an invalid configuration for relation "receiver" "

https://www.dropbox.com/s/oq1jpbfpftih6mo/message.rar

Can someone please help me ?!