QGIS » QGIS Application

After installing the OpenStreetMap plugin I'm having this error every where open and close shapefiles.

I think it is due even to settings "Reproject On The Fly" and EPSG:3003 (not wgs84).

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Errore durante l'esecuzione di codice Python:
(Error executing python code)

Traceback (most recent call last):
File "C:/OSGeo4W/apps/qgis-dev/./python/plugins\\osm\\OsmDatabaseManager.py", line 130, in layerRemoved
if layer.type() != QgsMapLayer.VectorLayer or layer.dataProvider().name()"osm":
AttributeError: 'NoneType' object has no attribute 'VectorLayer'

Versione Python:
2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)]

Versione di QGIS:
1.5.0-Tethys Tethys, 13750

Percorso Python: ['C:/OSGeo4W/apps/qgis-dev/./python', 'C:\\\\Users\\\\peri/.qgis/python', 'C:\\\\Users\\\\peri/.qgis/python/plugins', 'C:/OSGeo4W/apps/qgis-dev/./python/plugins', 'C:\\\\OSGeo4W\\\\apps\\\\gdal-16\\\\pymod', 'C:\\\\', 'C:\\\\OSGeo4W\\\\bin\\\\python25.zip', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\DLLs', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib\\\\plat-win', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib\\\\lib-tk', 'C:\\\\OSGeo4W\\\\apps\\\\qgis-dev\\\\bin', 'C:\\\\OSGeo4W\\\\apps\\\\Python25', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib\\\\site-packages', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib\\\\site-packages\\\\win32', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib\\\\site-packages\\\\win32\\\\lib', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib\\\\site-packages\\\\Pythonwin', 'C:\\\\OSGeo4W\\\\apps\\\\Python25\\\\lib\\\\site-packages\\\\wx-2.8-msw-unicode', u'C:/Users/peri/.qgis//python/plugins', 'C:\\\\OSGeo4W\\\\apps\\\\qgis-dev\\\\python\\\\plugins\\\\fTools\\\\tools']