License Class Conflict This wiki FAQ topic shows how to fix the license class conflict and addresses the answer to the questions posted at http://www.aspose.com/community/forums/thread/20561/where-to-place-lic-file.aspx http://www.aspose.com/community/forums/thread/14684/trying-to-install-new-license.aspx http://www.aspose.com/community/forums/thread/19996/license-conflict.aspx Each Aspose component includes a License class. More info please check Use License. But Microsoft .Net Class Library has the same class name: System.ComponentModel.License . So in some situation, you will get License class naming conflict. To fix it, please specify the name of the class fully when you use License.SetLicense method. Take Aspose.Word.License as an example: Aspose.Word.License license = new Aspose.Word.License(); The same thing could happen if you are using several Aspose products simultaneously and you have included using directives with appropriate namespaces, for example: using Aspose.Word; using Aspose.Pdf; The solution is the same - use fully qualified name for License.