size.width>0 && size.height>0 in function 'imshow'

import cv2
img = cv2.imread("Rec-000026_16bit_counts.tif", cv2.IMREAD_UNCHANGED)
cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()

---------------------------------------------------------------------------
error                                     Traceback (most recent call last)
<ipython-input-67-2756e499dadf> in <module>
      1 import cv2
      2 img = cv2.imread("Rec-000026_16bit_counts.tif", cv2.IMREAD_UNCHANGED)
----> 3 cv2.imshow('image',img)
      4 cv2.waitKey(0)
      5 cv2.destroyAllWindows()

error: OpenCV(3.4.9) /io/opencv/modules/highgui/src/window.cpp:382: error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'imshow'