Salt Minion TypeError

versions and traceback

## Salt Package Repo
deb http://ppa.launchpad.net/saltstack/salt/ubuntu trusty main

## Salt Master Version Report
root@salt:~# salt --versions-report
                  Salt: 2015.5.3
                Python: 2.7.6 (default, Jun 22 2015, 17:58:13)
                Jinja2: 2.7.2
              M2Crypto: 0.21.1
        msgpack-python: 0.3.0
          msgpack-pure: Not Installed
              pycrypto: 2.6.1
               libnacl: Not Installed
                PyYAML: 3.10
                 ioflo: Not Installed
                 PyZMQ: 14.0.1
                  RAET: Not Installed
                   ZMQ: 4.0.4
                  Mako: 0.9.1
               Tornado: Not Installed
 Debian source package: 2015.5.3+ds-1trusty1

## Salt Minion Version Report
                  Salt: 2015.5.3
                Python: 2.7.6 (default, Jun 22 2015, 17:58:13)
                Jinja2: 2.7.2
              M2Crypto: 0.21.1
        msgpack-python: 0.3.0
          msgpack-pure: Not Installed
              pycrypto: 2.6.1
               libnacl: Not Installed
                PyYAML: 3.10
                 ioflo: Not Installed
                 PyZMQ: 14.0.1
                  RAET: Not Installed
                   ZMQ: 4.0.4
                  Mako: 0.9.1
               Tornado: Not Installed
 Debian source package: 2015.5.3+ds-1trusty1
 
## Salt Minion Traceback

root@seven:/home/rv# salt-call test.version
[ERROR   ] An un-handled exception was caught by salt's global exception handler:
TypeError: coercing to Unicode: need string or buffer, NoneType found
Traceback (most recent call last):
  File "/usr/bin/salt-call", line 11, in <module>
    salt_call()
  File "/usr/lib/python2.7/dist-packages/salt/scripts.py", line 227, in salt_call
    client.run()
  File "/usr/lib/python2.7/dist-packages/salt/cli/call.py", line 59, in run
    caller = salt.cli.caller.Caller.factory(self.config)
  File "/usr/lib/python2.7/dist-packages/salt/cli/caller.py", line 69, in factory
    return ZeroMQCaller(opts, **kwargs)
  File "/usr/lib/python2.7/dist-packages/salt/cli/caller.py", line 92, in __init__
    self.minion = salt.minion.SMinion(opts)
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 298, in __init__
    opts['grains'] = salt.loader.grains(opts)
  File "/usr/lib/python2.7/dist-packages/salt/loader.py", line 514, in grains
    ret = fun()
  File "/usr/lib/python2.7/dist-packages/salt/grains/core.py", line 1049, in os_data
    with open(init_bin, 'rb') as fp_:
TypeError: coercing to Unicode: need string or buffer, NoneType found
Traceback (most recent call last):
  File "/usr/bin/salt-call", line 11, in <module>
    salt_call()
  File "/usr/lib/python2.7/dist-packages/salt/scripts.py", line 227, in salt_call
    client.run()
  File "/usr/lib/python2.7/dist-packages/salt/cli/call.py", line 59, in run
    caller = salt.cli.caller.Caller.factory(self.config)
  File "/usr/lib/python2.7/dist-packages/salt/cli/caller.py", line 69, in factory
    return ZeroMQCaller(opts, **kwargs)
  File "/usr/lib/python2.7/dist-packages/salt/cli/caller.py", line 92, in __init__
    self.minion = salt.minion.SMinion(opts)
  File "/usr/lib/python2.7/dist-packages/salt/minion.py", line 298, in __init__
    opts['grains'] = salt.loader.grains(opts)
  File "/usr/lib/python2.7/dist-packages/salt/loader.py", line 514, in grains
    ret = fun()
  File "/usr/lib/python2.7/dist-packages/salt/grains/core.py", line 1049, in os_data
    with open(init_bin, 'rb') as fp_:
TypeError: coercing to Unicode: need string or buffer, NoneType found