运行智能镜子时覆盆子pi问题

Question

我想在树莓派上安装智能镜像。我已完成所有初始步骤，但运行智能镜像时出错。错误是

未指定协议

Traceback (most recent call last):
   File "mm.py", line 329, in <module>
     w = FullscreenWindow()
   File "mm.py", line 296, in __init__
     self.tk = Tk()
   File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1813, in __init__
     self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
 _tkinter.TclError: couldn't connect to display ":0.0"  

任何人都可以帮助我吗？