Microsoft.Azure.Mobile.Client.SQLiteStore upgraded to 3.0 - Get error unable to open database file

Hi
After I've upgraded Microsoft.Azure.Mobile.Client.SQLiteStore upgraded to 3.0 get an error Microsoft.WindowsAzure.MobileServices.SQLiteStore.SQLiteException: Error executing SQLite command: 'unable to open database file'.
with the command
new MobileServiceSQLiteStore(path);
Before the upgrade no problem at all !
Any ideas ? Tnx