OSError: [Errno 2] No such file or directory: '/dev/ttyUB0'

OS: CentOS6
Problem appears when ran as root and non-root.
Install directory; /usr/mark2
Python -V outputs 2.6.6 however I have 2.7 installed as well.

Full error:

/usr/lib64/python2.6/site-packages/zope/__init__.py:3: UserWarning: Module twisted was already imported from /usr/lib64/python2.6/twisted/__init__.pyc, but /usr/lib64/python2.6/site-packages is being added to sys.path
  import pkg_resources
Traceback (most recent call last):
  File "/usr/bin/mark2", line 3, in <module>
    from mk2.launcher import main
  File "/usr/mark2/mk2/launcher.py", line 14, in <module>
    from . import manager
  File "/usr/mark2/mk2/manager.py", line 12, in <module>
    from .services import process
  File "/usr/mark2/mk2/services/process.py", line 4, in <module>
    import psutil
  File "/usr/lib64/python2.6/site-packages/psutil/__init__.py", line 65, in <module>
    import psutil._pslinux as _psplatform
  File "/usr/lib64/python2.6/site-packages/psutil/_pslinux.py", line 87, in <module>
    _TERMINAL_MAP = _psposix._get_terminal_map()
  File "/usr/lib64/python2.6/site-packages/psutil/_psposix.py", line 117, in _get_terminal_map
    ret[os.stat(name).st_rdev] = name
OSError: [Errno 2] No such file or directory: '/dev/ttyUB0'