BUG: Got a second transition to DONE

edit

When i am sending the move base goal from my ros node. Sometime i'm getting this error message. Can anyone tell me what this bug means and what is causing it?

    ROS_INFO("cognition: Sending move_base/clear_costmaps request!");    
    std_srvs::Empty srv;
    bool clear_costmap = clear_costmap_client.call(srv);
    if (clear_costmap)
    {
        ROS_INFO("cognition: move_base/clear_costmaps done!");
        retry_count = 0;
        publishMoveBaseGoal(mission.way_pnts[CURR_GOAL_IND].pose);  
    }
    else
    {
        ROS_ERROR("cognition: Failed to call service move_base/clear_costmaps");
    }
void publishMoveBaseGoal(const geometry_msgs::Pose pose) {
    goal.target_pose.header.stamp = ros::Time::now();
    goal.target_pose.pose = pose;
    ac.sendGoal(goal,
                boost::bind(&Cognition::doneMoveBaseCb, this, _1, _2),
                MoveBaseClient::SimpleActiveCallback(),
                MoveBaseClient::SimpleFeedbackCallback());
    ROS_INFO("cognition: move_base goal sent for %d time", retry_count);     
    EXE_MISSION = false;
}