OpenCV / Array should be CvMat or IplImage / Releasing a capture object

Edit : Array should be CvMat or IplImage is not an error message specific to this issue, that's the only most relevant error message i got.

I'm trying to make an *.exe out of an application using opencv.

I'm using Python 2.6 and openCV 2.1.

I can run part of the *.exe, i'm having a menu from where i can choose to process some pictures from 2 differents sources my webcam & a static image. The static image part works but when i'm chosing the webcam here is the output:

OpenCV Error: Bad argument (Array should be CvMat or IplImage) in unknown function, file ..\..\..\..\ocv\opencv\src\cxcore\cxarray.cpp,
 line 1233
Traceback (most recent call last):
  File "_ctypes/callbacks.c", line 295, in 'calling callback function'
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.window.win32", line 849, in _wnd_proc
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.window.win32", line 918, in _event_key
  File "game_ar\开发者_StackOverflowbuild\pyi.win32\game_ar\outPYZ1.pyz/pyglet.window", line 1219, in dispatch_event
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.event", line 340, in dispatch_event
  File "", line 502, in on_key_press
  File "", line 461, in dostart
  File "", line 482, in getpoints
  File "D:\Prog\Python\AugmentedR\src\pyar.py", line 40, in get_points
    pilimage = Image.fromstring("RGB", cv.GetSize(image), image.tostring())
cv.error: Array should be CvMat or IplImage
Traceback (most recent call last):
  File "", line 616, in 
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.app", line 264, in run
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.app.win32", line 63, in run
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.app.win32", line 84, in _timer_func
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.app", line 193, in idle
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.window", line 1219, in dispatch_event
  File "game_ar\build\pyi.win32\game_ar\outPYZ1.pyz/pyglet.event", line 340, in dispatch_event
  File "", line 546, in on_draw
AttributeError: Game instance has no attribute 'bg'

My pyar.py file.

Building the *.exe with py2exe gave me this output :

The following modules appear to be missing
['ICCProfile', '_imaging_gif', '_scproxy']

I don't get it, this is working with my sources. I tried to pack my application with py2exe & pyinstaller, but the output is the same.

I guess the *.exe is missing something but i don't know what neither how to debug it.

It was not related to the packagers.

The problem was that I wasn't closing the webcam capture, several processes of my app were actually running in the background.

The doc is talking about ReleaseCapture but this function is apparently not in the python bindings, calling :

del(self.cam)

did the job just well, self.cam being my CvCapture object.