Exception thrown when calling 'Properties.Settings.Default.Save()'

See more:

C#

.NET

WPF

My application threw an exception when it tried to save some user configuration settings by calling 'Properties.Settings.Default.Save()'.

Code:

Properties.Settings.Default.UserProp = "MyUserValue";
Properties.Settings.Default.Save();

The exception is:

System.Configuration.ConfigurationErrorsException was caught
  BareMessage=Failed to save settings: A configuration file cannot be created for the requested Configuration object.
  Line=0
  Message=Failed to save settings: A configuration file cannot be created for the requested Configuration object.
  Source=System
  StackTrace:
       at System.Configuration.ClientSettingsStore.WriteSettings(String sectionName, Boolean isRoaming, IDictionary newSettings)
       at System.Configuration.LocalFileSettingsProvider.SetPropertyValues(SettingsContext context, SettingsPropertyValueCollection values)
       at System.Configuration.SettingsBase.SaveCore()
       at System.Configuration.SettingsBase.Save()
       at System.Configuration.ApplicationSettingsBase.Save()
       at ETSquare.MainWindow.Eingangsart_Changed(Object sender, RoutedPropertyChangedEventArgs`1 e)
  InnerException: System.Configuration.ConfigurationErrorsException
       BareMessage=A configuration file cannot be created for the requested Configuration object.
       Line=0
       Message=A configuration file cannot be created for the requested Configuration object.
       Source=System.Configuration
       StackTrace:
            at System.Configuration.MgmtConfigurationRecord.SaveAs(String filename, ConfigurationSaveMode saveMode, Boolean forceUpdateAll)
            at System.Configuration.Configuration.SaveAsImpl(String filename, ConfigurationSaveMode saveMode, Boolean forceSaveAll)
            at System.Configuration.ClientSettingsStore.WriteSettings(String sectionName, Boolean isRoaming, IDictionary newSettings)
       InnerException:

This problem happens on every Machine. The environment is Windows XP 32-bit andWindows 7 64bit

The application is a WPF-Browser-Application (xbap).

If I put a 'Properties.Settings.Default.Upgrade()' before the save-command,

Code:

Properties.Settings.Default.UserProp = "MyUserValue";
  Properties.Settings.Default.Upgrade();
  Properties.Settings.Default.Save();

I get

System.ArgumentNullException was caught
  Message=Value cannot be null.
Parameter name: path
  ParamName=path
  Source=mscorlib
  StackTrace:
       at System.IO.Directory.GetParent(String path)
       at System.Configuration.LocalFileSettingsProvider.GetPreviousConfigFileName(Boolean isRoaming)
       at System.Configuration.LocalFileSettingsProvider.Upgrade(SettingsContext context, SettingsPropertyCollection properties, Boolean isRoaming)
       at System.Configuration.LocalFileSettingsProvider.Upgrade(SettingsContext context, SettingsPropertyCollection properties)
       at System.Configuration.ApplicationSettingsBase.Upgrade()
       at ETSquare.MainWindow.Eingangsart_Changed(Object sender, RoutedPropertyChangedEventArgs`1 e)
  InnerException:

Any idea please. Thanks in advance.