Weird Py.test Result

pritishc@pritishc-GA-78LMT-USB3:/media/Data/SunPy Repo/sunpy$ py.test sunpy -k-fails_on_travis
Traceback (most recent call last):
  File "/usr/local/bin/py.test", line 9, in <module>
    load_entry_point('pytest==2.5.2', 'console_scripts', 'py.test')()
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 19, in main
    config = _prepareconfig(args, plugins)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 63, in _prepareconfig
    pluginmanager=pluginmanager, args=args)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 377, in __call__
    return self._docall(methods, kwargs)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 388, in _docall
    res = mc.execute()
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 289, in execute
    res = method(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/helpconfig.py", line 27, in pytest_cmdline_parse
    config = __multicall__.execute()
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 289, in execute
    res = method(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 618, in pytest_cmdline_parse
    self.parse(args)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 711, in parse
    self._preparse(args)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 691, in _preparse
    args=args, parser=self._parser)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 377, in __call__
    return self._docall(methods, kwargs)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 388, in _docall
    res = mc.execute()
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 289, in execute
    res = method(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/capture.py", line 83, in pytest_load_initial_conftests
    return __multicall__.execute()
  File "/usr/local/lib/python2.7/dist-packages/_pytest/core.py", line 289, in execute
    res = method(**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 674, in pytest_load_initial_conftests
    self._conftest.setinitial(args)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 487, in setinitial
    self._try_load_conftest(anchor)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 498, in _try_load_conftest
    self.getconftestmodules(x)
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 512, in getconftestmodules
    clist.append(self.importconftest(conftestpath))
  File "/usr/local/lib/python2.7/dist-packages/_pytest/config.py", line 538, in importconftest
    self._conftestpath2mod[conftestpath] = mod = conftestpath.pyimport()
  File "/usr/local/lib/python2.7/dist-packages/py/_path/local.py", line 608, in pyimport
    __import__(pkgpath.basename)
  File "/media/Data/SunPy Repo/sunpy/sunpy/__init__.py", line 23, in <module>
    from sunpy.util.config import load_config, print_config
  File "/media/Data/SunPy Repo/sunpy/sunpy/util/__init__.py", line 5, in <module>
    from sunpy.util.unit_conversion import *
  File "/media/Data/SunPy Repo/sunpy/sunpy/util/unit_conversion.py", line 5, in <module>
    from astropy import units
  File "/usr/local/lib/python2.7/dist-packages/astropy/__init__.py", line 231, in <module>
    from .logger import _init_log, _teardown_log
  File "/usr/local/lib/python2.7/dist-packages/astropy/logger.py", line 15, in <module>
    from .utils.console import color_print
  File "/usr/local/lib/python2.7/dist-packages/astropy/utils/console.py", line 47, in <module>
    import IPython  # pylint: disable=W0611
  File "/usr/lib/python2.7/dist-packages/IPython/__init__.py", line 43, in <module>
    from .config.loader import Config
  File "/usr/lib/python2.7/dist-packages/IPython/config/loader.py", line 27, in <module>
    from IPython.utils.path import filefind, get_ipython_dir
  File "/usr/lib/python2.7/dist-packages/IPython/utils/path.py", line 24, in <module>
    from IPython.utils.process import system
  File "/usr/lib/python2.7/dist-packages/IPython/utils/process.py", line 27, in <module>
    from ._process_posix import _find_cmd, system, getoutput, arg_split
  File "/usr/lib/python2.7/dist-packages/IPython/utils/_process_posix.py", line 27, in <module>
    from IPython.utils import text
  File "/usr/lib/python2.7/dist-packages/IPython/utils/text.py", line 30, in <module>
    from IPython.utils.io import nlprint
  File "/usr/lib/python2.7/dist-packages/IPython/utils/io.py", line 90, in <module>
    stdin = IOStream(sys.stdin)
  File "/usr/lib/python2.7/dist-packages/IPython/utils/io.py", line 32, in __init__
    raise ValueError("fallback required, but not specified")
ValueError: fallback required, but not specified