请帮帮忙

def change_flag(top_frame, bottom_frame, button1, button2, button3, button4, controller):
    global counter, canvas, my_image, chosen, flag, directory
    canvas.delete('all')
    button5['state'] = DISABLED
    counter += 1

    chosen, options_text = function_options()
    right_answer_flag = get_right_answer_flag(chosen, options_text)
    #pdb.set_trace()

    try:
        location = directory + chosen + format_image
    except:
        controller.show_frame(PlayAgainExit)
        
    my_image = PhotoImage(file=location)
    canvas.create_image(160, 100, anchor=CENTER, image=my_image)

    button1["text"] = options_text[0]
    button2["text"] = options_text[1]
    button3["text"] = options_text[2]
    button4["text"] = options_text[3]

    button1['state'] = NORMAL
    button2['state'] = NORMAL
    button3['state'] = NORMAL
    button4['state'] = NORMAL

##############

        button5 = Button(
            next_frame,
            width=20,
            text="next",
            fg="black",
            #command=lambda: change_flag(top_frame,bottom_frame,button1,button2,button3,button4,controller))
            command=Thread(target=change_flag, args =(top_frame,bottom_frame,button1,button2,button3,button4,controller)).start)
            
        button5.pack(side=RIGHT, padx=5, pady=5)

你好，
我不希望GUI冻结，所以我使用button5的线程，但它给我的运行时错误“你可以启动线程只有一次”这是正确的。但我应该如何解决这个问题？
谢谢你的帮助，阿沛