ValueError: a must be greater than 0 unless no samples are taken

[monkeycc]

python image_mosaic.py
 #### Processing 1.jpg & 2.jpg ######
N: 1122.0, n: 6, M:0.0, p: 0.99, eps: 0.6, delta: 3
Traceback (most recent call last):
  File "image_mosaic.py", line 222, in <module>
    obj.mosaic()
  File "image_mosaic.py", line 40, in mosaic
    inliers_cnt, inliers, outliers, sample_pts, final_H = ransac_obj.run_ransac(correspondence)
  File "D:\Image-Mosaicing\ransac.py", line 115, in run_ransac
    idx, n_idx = self.sample_n_datapts(n_total, self.n)
  File "D:\Image-Mosaicing\ransac.py", line 47, in sample_n_datapts
    idx = np.random.choice(n_total, n, replace=True)
  File "mtrand.pyx", line 909, in numpy.random.mtrand.RandomState.choice
ValueError: a must be greater than 0 unless no samples are taken