Traceback (most recent call last):
  File "site.py", line 63, in <module>
    i2c = busio.I2C(board.SCL, board.SDA)
  File "/home/pav/venv/lib/python3.5/site-packages/busio.py", line 16, in __init__
    self.init(scl, sda, frequency)
  File "/home/pav/venv/lib/python3.5/site-packages/busio.py", line 27, in init
    self._i2c = _I2C(portId, mode=_I2C.MASTER, baudrate=frequency)
  File "/home/pav/venv/lib/python3.5/site-packages/adafruit_blinka/microcontroller/generic_l
inux/i2c.py", line 20, in __init__

    self._i2c_bus = smbus.SMBus(bus_num)
  File "/home/pav/venv/lib/python3.5/site-packages/Adafruit_PureIO/smbus.py", line 105, in _
_init__
    self.open(bus)
  File "/home/pav/venv/lib/python3.5/site-packages/Adafruit_PureIO/smbus.py", line 130, in o
pen
    self._device = open('/dev/i2c-{0}'.format(bus), 'r+b', buffering=0)
PermissionError: [Errno 13] Permission denied: '/dev/i2c-1'