output meaning ful error message

sessionManager.go

 			log.Fatal("session job count cannot be negative, problem session")
 		}
 	} else {
+		log.Println(d)
 		log.Fatal("When job done, we canot find proper session")
 	}
 }
 //worker thread
 func (m *SessionManager) startJob(openID string) {
 	log.Println("start job worker...")
-	s := m.sessions[openID]
 	jobFinished := workDone{openID, 0}
 	//process all jobs in the channel
 	hasJob := true
 	for hasJob {
 		select {
-		case v := <-s.jobs:
+		case v := <-m.sessions[openID].jobs:
+			if v.header.FromUserName != openID {
+				log.Println("Error: Weird Message below ...")
+				log.Println(v)
+				log.Fatalf("Error: worker thread for %s, see different id=%s \n", openID, v.header.FromUserName)
+			}
 			log.Println(" Processing job..")
 			log.Println(v)
 			time.Sleep(5 * time.Second)