Konnte Erweiterung MetaSearch nicht laden aufgrund eines Fehlers beim Aufruf der classFactory() Methode 

ImportError: No module named owslib.csw 
Traceback (most recent call last):
  File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python\qgis\utils.py", line 333, in startPlugin
    plugins[packageName] = package.classFactory(iface)
  File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins\MetaSearch\__init__.py", line 29, in classFactory
    from MetaSearch.plugin import MetaSearchPlugin
  File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python\qgis\utils.py", line 607, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins\MetaSearch\plugin.py", line 33, in 
    from MetaSearch.dialogs.maindialog import MetaSearchDialog
  File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python\qgis\utils.py", line 607, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
  File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins\MetaSearch\dialogs\maindialog.py", line 43, in 
    from owslib.csw import CatalogueServiceWeb
  File "C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python\qgis\utils.py", line 607, in _import
    mod = _builtin_import(name, globals, locals, fromlist, level)
ImportError: No module named owslib.csw


Python-Version: 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit (AMD64)] 
QGIS-Version: 2.18.5 Las Palmas, 0378214 

Python-Pfad:
C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python
C:/Users/Spieles.G/.qgis2/python
C:/Users/Spieles.G/.qgis2/python/plugins
C:/PROGRA~1/QGIS2~1.18/apps/qgis/./python/plugins
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\matplotlib-1.3.1-py2.7-win-amd64.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\nose-1.3.3-py2.7.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\tornado-4.0.1-py2.7-win-amd64.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\backports.ssl_match_hostname-3.4.0.2-py2.7.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\certifi-14.05.14-py2.7.egg
C:\PROGRA~1\QGIS2~1.18\bin\python27.zip
C:\PROGRA~1\QGIS2~1.18\apps\Python27\DLLs
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\plat-win
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\lib-tk
C:\PROGRA~1\QGIS2~1.18\bin
C:\PROGRA~1\QGIS2~1.18\apps\Python27
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\PIL
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\jinja2-2.7.2-py2.7.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\markupsafe-0.23-py2.7-win-amd64.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\win32
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\win32\lib
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\Pythonwin
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\Shapely-1.2.18-py2.7-win-amd64.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\wx-2.8-msw-unicode
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\xlrd-0.9.2-py2.7.egg
C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\xlwt-0.7.5-py2.7.egg
C:/Users/Spieles.G/.qgis2//python
C:\Users\Spieles.G\.qgis2\python\plugins\mmqgis/forms