QGIS » QGIS Application

When try to disinstall the plugin VTerrain.
I have a python error:

Si è verificato un errore durante l'esecuzione delle seguenti istruzioni:
pyplugin_installer.instance().uninstallPlugin('VTerrain')

Traceback (most recent call last):
File "", line 1, in
File "C:/my-programs/OSGeo4W/apps/qgis-dev/./python\\pyplugin_installer\\installer.py", line 383, in uninstallPlugin
pluginDir = qgis.utils.home_python_pluginpath + "/" + plugin["id"]
AttributeError: 'module' object has no attribute 'home_python_pluginpath'

Versione Python:
2.7.4 (default, Apr 6 2013, 19:54:46) [MSC v.1500 32 bit (Intel)]

Versione di QGIS:
2.1.0-Master 'Master', e04b426

Percorso Python:
['C:/Users/Andrea/.qgis2/python/plugins\\\\processinglwgeomprovider', 'C:/my-programs/OSGeo4W/apps/qgis-dev/./python/plugins\\\\processing', 'C:/my-programs/OSGeo4W/apps/qgis-dev/./python', u'C:/Users/Andrea/.qgis2/python', u'C:/Users/Andrea/.qgis2/python/plugins', 'C:/my-programs/OSGeo4W/apps/qgis-dev/./python/plugins', 'C:\\\\my-programs\\\\OSGeo4W\\\\bin\\\\python27.zip', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\DLLs', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\plat-win', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\lib-tk', 'C:\\\\my-programs\\\\OSGeo4W\\\\bin', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\PIL', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\win32', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\win32\\\\lib', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\Pythonwin', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\Python27\\\\lib\\\\site-packages\\\\wx-2.8-msw-unicode', 'C:\\\\my-programs\\\\OSGeo4W\\\\apps\\\\qgis-dev\\\\python\\\\plugins\\\\fTools\\\\tools']