Arandr error

jayneil@jayneil-pc:~/Downloads/arandr-0.1.6$ ./arandr

Traceback (most recent call last):

  File "./arandr", line 42, in <module>

    main()

  File "/home/jayneil/Downloads/arandr-0.1.6/screenlayout/gui.py", line 318, in main

    force_version=options.force_version

  File "/home/jayneil/Downloads/arandr-0.1.6/screenlayout/gui.py", line 159, in __init__

    self.filetemplate = self.widget.load_from_x()

  File "/home/jayneil/Downloads/arandr-0.1.6/screenlayout/widget.py", line 93, in load_from_x

    self._xrandr.load_from_x()

  File "/home/jayneil/Downloads/arandr-0.1.6/screenlayout/xrandr.py", line 150, in load_from_x

    o.modes.append(Size(int(a) for a in d.strip().split(" ")[0].split("x")))

  File "/home/jayneil/Downloads/arandr-0.1.6/screenlayout/auxiliary.py", line 53, in __new__

    arg = tuple(arg)

  File "/home/jayneil/Downloads/arandr-0.1.6/screenlayout/xrandr.py", line 150, in <genexpr>

    o.modes.append(Size(int(a) for a in d.strip().split(" ")[0].split("x")))

ValueError: invalid literal for int() with base 10: '480i'