ranger crash

$ ranger --debug
ranger version: 1.7.2, executed with python 2.7.13
Locale: en_US.UTF-8
Current file: /home/bucky/.backgrounds/2U9ysiA.jpg
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/ranger/core/main.py", line 140, in main
    fm.loop()
  File "/usr/local/lib/python2.7/site-packages/ranger/core/fm.py", line 342, in loop
    ui.draw_images()
  File "/usr/local/lib/python2.7/site-packages/ranger/gui/ui.py", line 323, in draw_images
    self.browser.columns[-1].draw_image()
  File "/usr/local/lib/python2.7/site-packages/ranger/gui/widgets/pager.py", line 97, in draw_image
    self.fm.notify(e, bad=True)
  File "/usr/local/lib/python2.7/site-packages/ranger/gui/widgets/pager.py", line 93, in draw_image
    self.wid, self.hei)
  File "/usr/local/lib/python2.7/site-packages/ranger/ext/img_display.py", line 65, in draw
    self.initialize()
  File "/usr/local/lib/python2.7/site-packages/ranger/ext/img_display.py", line 60, in initialize
    stdin=PIPE, stdout=PIPE, universal_newlines=True)
  File "/usr/local/lib/python2.7/subprocess.py", line 390, in __init__
    errread, errwrite)
  File "/usr/local/lib/python2.7/subprocess.py", line 1024, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

ranger crashed.  Please report this traceback at:
https://github.com/hut/ranger/issues