Fail with Stitcher and Python

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I'm trying to learn how to use OpenCV with Stitcher

Windows 7

Python 3.4.1

OpenCV 3.1.0 precompiled

import cv2

im1 = cv2.imread('1.jpg')
im2 = cv2.imread('2.jpg')
stitcher = cv2.createStitcher()

result = stitcher.stitch((im1,im2))

on last line there is error

cv2.error: ..\..\..\opencv-3.1.0\modules\python\src2\cv2.cpp:163: error: (-215) The data should normally be NULL! in function NumpyAllocator::allocate

Is it issue or I do not undertand stitcher usage in Python? I found no examples.