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我有一个 Raspberry，我正在尝试连接到 Ubidots IOT 云，但出现以下错误：

pi@raspberrypi:~/Downloads/raspbiDaniela/Ver 2016/ZonrProject $ python main.py
    Traceback (most recent call last):
      File "main.py", line 124, in <module>
        main()
      File "main.py", line 21, in main
        ser = serial.Serial(port=port, baudrate=baud)
      File "/usr/lib/python2.7/dist-packages/serial/serialutil.py", line 261, in __init__
        self.open()
      File "/usr/lib/python2.7/dist-packages/serial/serialposix.py", line 278, in open
        raise SerialException("could not open port %s: %s" % (self._port, msg))
    serial.serialutil.SerialException: could not open port /dev/ttyAMA0: [Errno 13] Permission denied: '/dev/ttyAMA0'