[Python] Python-OpenCv FindContours

I try to find contours in a binary image but when try to execute cvFindContours it gives me that error message

Traceback (most recent call last): File "convert.py", line 30, in contour = cvFindContours(img2, storage, cv.CV_RETR_CCOMP, cv.CV_CHAIN_APPROX_SIMPLE) File "/usr/lib/pymodules/python2.7/opencv/cv.py", line 580, in cvFindContours count, seq = cvFindContoursUntyped( *args ) File "/usr/lib/pymodules/python2.7/opencv/cv.py", line 6521, in cvFindContoursUntyped return _cv.cvFindContoursUntyped(*args) RuntimeError: openCV Error: Status=Incorrect size of input array function name=cvStartFindContours error message= file_name=/build/buildd/opencv-2.1.0/src/cv/cvcontours.cpp line=205
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I using fresh installed Ubuntu 11.10 and Opencv 2.3.1.

Here is my source code

from opencv.cv import *
from opencv.highgui import *

image = cvLoadImage('test.png')
def getthresholdedimg(image):
size = cvSize(640, 480)

imghsv=cvCreateImage(cvGetSize(image),8,3)
cvCvtColor(image,imghsv,cv.CV_BGR2HSV)
imgblue=cvCreateImage(cvGetSize(image),8,1)
imgblue2=cvCreateImage(cvGetSize(image),8,1)
imgthreshold=cvCreateImage(cvGetSize(image),8,1)

cvInRangeS(imghsv,cvScalar(100,100,100),cvScalar(120,255,255),imgblue)
cvInRangeS(imghsv,cvScalar(100,100,100),cvScalar(120,255,255),imgblue2)
cvAdd(imgblue,imgblue,imgthreshold)
return imgthreshold


cvFlip(image,image,1)

cvSmooth(image, image, CV_GAUSSIAN, 3, 0)
imgthresh=getthresholdedimg(image)
cvErode(imgthresh,imgthresh,None,3)
cvDilate(imgthresh,imgthresh,None,10)
storage = cvCreateMemStorage(0)
img2=cvCloneImage(imgthresh)
contour = cvFindContours(img2, storage, cv.CV_RETR_CCOMP, cv.CV_CHAIN_APPROX_SIMPLE)


my original and binary image

Original image http://tinypic.com/r/34rul9x/6

and blue filtered binary image http://tinypic.com/r/ifbotx/6

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