pytesseract-no such file or directory error

I am using Ubuntu 14.04. I have the following code: ``` import Image import pytesseract im = Image.open('test.png') print pytesseract.image_to_string(im) ``` but I keep getting the following error: ``` Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib/python2.7/dist-packages/spyderlib/widgets/externalshell/sitecustomize.py", line 540, in runfile execfile(filename, namespace) File "/home/chaitanya/pythonapp/localcopy.py", line 4, in <module> print pytesseract.image_to_string(im) File "/usr/local/lib/python2.7/dist-packages/pytesseract/pytesseract.py", line 142, in image_to_string config=config) File "/usr/local/lib/python2.7/dist-packages/pytesseract/pytesseract.py", line 75, in run_tesseract stderr=subprocess.PIPE) File "/usr/lib/python2.7/subprocess.py", line 710, in __init__ errread, errwrite) File "/usr/lib/python2.7/subprocess.py", line 1327, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory ``` Both the python program and the image are in the same location.What could be the problem??