virtualbox-python: UnicodeDecodeError using take_screen_shot_to_array()

This happens with both VirtualBox PUEL and VirtualBox OSE (setting sys.abiflags = '').

In [1]: import virtualbox
   ...: vbox = virtualbox.VirtualBox()
   ...: vm = vbox.find_machine(vbox.machines[0].name)
   ...: session = vm.create_session()
   ...: h, w, _, _, _, _ = session.console.display.get_screen_resolution(0)
   ...: png = session.console.display.take_screen_shot_to_array(0, h, w, virtualbox.library.BitmapFormat.png)
   ...: 
---------------------------------------------------------------------------
UnicodeDecodeError                        Traceback (most recent call last)
~/development/virtualenvs/pyvbox/lib/python3.5/site-packages/virtualbox/library_base.py in _call_method(self, method, in_p)
    194         try:
--> 195             ret = method(*in_params)
    196         except Exception as exc:

/usr/lib/virtualbox/sdk/bindings/xpcom/python/xpcom/client/__init__.py in takeScreenShotToArray(self, Param1, Param2, Param3, Param4)

UnicodeDecodeError: 'utf-8' codec can't decode byte 0x89 in position 0: invalid start byte

During handling of the above exception, another exception occurred:

AttributeError                            Traceback (most recent call last)
<ipython-input-1-a41323a6ea59> in <module>()
      4 session = vm.create_session()
      5 h, w, _, _, _, _ = session.console.display.get_screen_resolution(0)
----> 6 png = session.console.display.take_screen_shot_to_array(0, h, w, virtualbox.library.BitmapFormat.png)

~/development/virtualenvs/pyvbox/lib/python3.5/site-packages/virtualbox/library.py in take_screen_shot_to_array(self, screen_id, width, height, bitmap_format)
  23680             raise TypeError("bitmap_format can only be an instance of type BitmapFormat")
  23681         screen_data = self._call("takeScreenShotToArray",
> 23682                      in_p=[screen_id, width, height, bitmap_format])
  23683         return screen_data
  23684 

~/development/virtualenvs/pyvbox/lib/python3.5/site-packages/virtualbox/library_base.py in _call(self, name, in_p)
    184         method = self._search_attr(name)
    185         if inspect.isfunction(method) or inspect.ismethod(method):
--> 186             return self._call_method(method, in_p=in_p)
    187         else:
    188             return method

~/development/virtualenvs/pyvbox/lib/python3.5/site-packages/virtualbox/library_base.py in _call_method(self, method, in_p)
    210 
    211             if errobj.msg is None:
--> 212                 errobj.msg = getattr(exc, 'msg', getattr(exc, 'message'))
    213             raise errobj
    214         return ret

AttributeError: 'UnicodeDecodeError' object has no attribute 'message'

XPCOM client init file. xpcom_cli_init.txt