Python findFundamentalMat

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I keep getting the error:

Traceback (most recent call last):
  File "OpenCVTest.py", line 73, in <module>
    (retval,mask) = cv.findFundamentalMat(c1,c2)
cv2.error: /tmp/homebrew-opencv-2.4.2-OdWH/OpenCV-2.4.2/modules/calib3d/src/fundam.cpp:1103: error: (-215) npoints >= 0 && points2.checkVector(2) == npoints && points1.type() == points2.type() in function findFundamentalMat

Where c1 and c2 are 8 by 2 ndarrays.

It works in cv, but not in cv2. Is this a bug or am I doing something wrong?

I am using OpenCV 2.4.2 in Python 2.7.3.

Thanks!