jython pip install flask

gistfile1.txt

C:\Users\mgolisch\Source\venv\flask-jython\bin>jython.bat pip install Flask
Traceback (most recent call last):
  File "pip", line 8, in <module>
    sys.exit(
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\setuptools-
5.7-py2.7.egg\pkg_resources$py.class", line 356, in load_entry_point
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\setuptools-
5.7-py2.7.egg\pkg_resources$py.class", line 2472, in load_entry_point
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\setuptools-
5.7-py2.7.egg\pkg_resources$py.class", line 2185, in load
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\pip-1.5.6-p
y2.7.egg\pip\__init__.py", line 11, in <module>
    from pip.vcs import git, mercurial, subversion, bazaar  # noqa
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\pip-1.5.6-p
y2.7.egg\pip\vcs\subversion.py", line 4, in <module>
    from pip.index import Link
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\pip-1.5.6-p
y2.7.egg\pip\index.py", line 17, in <module>
    from pip._vendor import html5lib, requests, pkg_resources
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\pip-1.5.6-p
y2.7.egg\pip\_vendor\html5lib\__init__.py", line 16, in <module>
    from .html5parser import HTMLParser, parse, parseFragment
  File "C:\Users\mgolisch\Source\venv\flask-jython\Lib\site-packages\pip-1.5.6-p
y2.7.egg\pip\_vendor\html5lib\html5parser.py", line 6, in <module>
    from . import inputstream
UnicodeDecodeError: 'unicodeescape' codec can't decode bytes in position 47-53:
illegal Unicode character