Trouble getting pip to work DistributionNotFound

Question

i recently with Python coding a little programm with a simple GUI (Tkinter). Now i need PIL to use images. I want to install PIL using PIP but. After installing PIP it always gives me this output:

Traceback (most recent call last):
  File "/usr/local/bin/pip", line 5, in <module>
    from pkg_resources import load_entry_point
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 2872, in <module>


  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 451, in _build_master
    def _build_from_requirements(cls, req_spec):
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 464, in _build_from_requirements
    for entry in sys.path:
  File "build/bdist.linux-x86_64/egg/pkg_resources.py", line 639, in resolve
    fallback=True):
pkg_resources.DistributionNotFound: pip==1.5.6

Does anyone know what happend here? I'm using Elementary OS Freya (Ubuntu 14.04)