QObject::connect:无法对'QTextCursor‘类型的参数排队

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QObject::connect: Cannot queue arguments of type 'QTextCursor'
(Make sure 'QTextCursor' is registered using qRegisterMetaType().)

 class Sender(QtCore.QThread):
        def __init__(self,q):
            super(Sender,self).__init__()
            self.q=q
        def run(self):
            while True:
                try: line = q.get_nowait()
             # or q.get(timeout=.1)
                except Empty: 
                else: 
                   self.emit(QtCore.SIGNAL('tri()')) 
 class Workspace(QMainWindow, Ui_MainWindow):
    """ This class is for managing the whole GUI `Workspace'.
        Currently a Workspace is similar to a MainWindow
    def __init__(self):  
            from Queue import Queue, Empty
        except ImportError:
            while True:
    #from queue import Queue, Empty  # python 3.x
                print "error"
        ON_POSIX = 'posix' in sys.builtin_module_names
        def enqueue_output(out, queue):
            for line in iter(out.readline, b''):
                queue.put(line)
            out.close()
        p= Popen(["java -Xmx256m -jar bin/HelloWorld.jar"],cwd=r'/home/karen/sphinx4-1.0beta5-src/sphinx4-1.0beta5/',stdout=PIPE, shell=True, bufsize= 4024)
        q = Queue()
        t = threading.Thread(target=enqueue_output, args=(p.stdout, q)) 
          t.daemon = True # thread dies with the program
        t.start()
        self.sender= Sender(q)
         self.connect(self.sender, QtCore.SIGNAL('tri()'), self.__action_About)
        self.sender.start()

def append_message(self, message):
    # this "instance" method is very useful!
    app_thread = QtWidgets.QApplication.instance().thread()
    curr_thread = QtCore.QThread.currentThread()

QObject::connect:无法对'QTextCursor‘类型的参数排队

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