Couldn't load plugin processing due to an error when calling its initGui() method


Traceback (most recent call last):
  File "C:/OSGEO4~1/apps/qgis/./python\qgis\utils.py", line 228, in startPlugin
    plugins[packageName].initGui()
  File "C:/Users/messer/.qgis2/python/plugins\processing\ProcessingPlugin.py", line 57, in initGui
    Processing.initialize()
  File "C:/Users/messer/.qgis2/python/plugins\processing\core\Processing.py", line 136, in initialize
    Processing.addProvider(SagaAlgorithmProvider())
  File "C:/Users/messer/.qgis2/python/plugins\processing\core\Processing.py", line 96, in addProvider
    % (provider.getDescription(), unicode(sys.exc_info()[1])))
  File "C:/Users/messer/.qgis2/python/plugins\processing\algs\saga\SagaAlgorithmProvider.py", line 108, in getDescription
    version = SagaUtils.getSagaInstalledVersion()
  File "C:/Users/messer/.qgis2/python/plugins\processing\algs\saga\SagaUtils.py", line 120, in getSagaInstalledVersion
    stdin=open(os.devnull),
IOError: [Errno 2] No such file or directory: 'nul'


Python version:
2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)]


QGIS version:
2.8.1-Wien Wien, exported

Python path: ['C:/Users/messer/.qgis2/python/plugins\\processing', 'C:\\Users\\messer\\.qgis2\\python\\plugins\\GeoCoding', 'C:/OSGEO4~1/apps/qgis/./python', u'C:/Users/messer/.qgis2/python', u'C:/Users/messer/.qgis2/python/plugins', 'C:/OSGEO4~1/apps/qgis/./python/plugins', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\matplotlib-1.3.1-py2.7-win-amd64.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\nose-1.3.3-py2.7.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\tornado-4.0.1-py2.7-win-amd64.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\backports.ssl_match_hostname-3.4.0.2-py2.7.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\certifi-14.05.14-py2.7.egg', 'c:\\osgeo4~1\\apps\\python27\\lib\\site-packages\\python_dateutil-2.1-py2.7.egg', 'c:\\osgeo4~1\\apps\\python27\\lib\\site-packages\\six-1.3.0-py2.7.egg', 'C:\\OSGEO4~1\\apps\\orfeotoolbox\\python', 'C:\\OSGEO4~1\\bin', 'C:\\OSGEO4~1\\bin\\python27.zip', 'C:\\OSGEO4~1\\apps\\Python27\\DLLs', 'C:\\OSGEO4~1\\apps\\Python27\\lib', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\plat-win', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\lib-tk', 'C:\\OSGEO4~1\\apps\\Python27', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\PIL', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\jinja2-2.7.2-py2.7.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\markupsafe-0.23-py2.7-win-amd64.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\OWSLib-0.7.2-py2.7.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\pytz-2012j-py2.7.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\win32', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\win32\\lib', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\Pythonwin', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\Shapely-1.2.18-py2.7-win-amd64.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\wx-2.8-msw-unicode', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\xlrd-0.9.2-py2.7.egg', 'C:\\OSGEO4~1\\apps\\Python27\\lib\\site-packages\\xlwt-0.7.5-py2.7.egg', u'C:/Users/messer/.qgis2//python', 'C:\\Users\\messer\\.qgis2\\python\\plugins\\DigitizingTools\\tools', 'C:\\Users\\messer\\.qgis2\\python\\plugins\\mmqgis/forms']