'module' object has no attribute 'check_output' in python 2.6

[oevna]

ERROR [2016-08-03 14:03:45.346690] An exception occurred None 'module' object has no attribute 'check_output' Traceback (most recent call last): File "/home/oevna/videoscripts/sprites/makesprites.py", line 292, in run(task) File "/home/oevna/videoscripts/sprites/makesprites.py", line 253, in run numfiles,thumbfiles = takesnaps(task.getVideoFile(),outdir, thumbRate=thumbRate) File "/home/oevna/videoscripts/sprites/makesprites.py", line 112, in takesnaps doCmd (cmd) File "/home/oevna/videoscripts/sprites/makesprites.py", line 97, in doCmd raise e #todo ? AttributeError: 'module' object has no attribute 'check_output'