Portions copyright (c) 2008 by Argo Interactive Limited. Portions copyright (c) 2008 by Nokia Inc. Portions copyright (c) 2008 by Telecom Italia Mobile S.p.A. Portions copyright (c) 2008 by Volantis Systems Limited. Portions copyright (c) 2002-2008 by Andreas Staeding. Portions copyright (c) 2008 by Zandan. The InvalidPropertyException is thrown by the Api class. When there is an attempt to fetch a property that is unknown for the supplied user agent.