Recent additions to the knowledge base from DiscountASP.NET https://support.discountasp.net/kb/c354/4_0.aspx Wed, 10 Jun 2026 04:36:49 GMT SmarterTrack Enterprise 100.0.9553 https://support.discountasp.net/kb/a796/asp_net-4_0-application-error-unrecognized-attribute-targetframework.aspx Fri, 09 Apr 2010 18:50:33 GMT kbarticle796 <div><span style="font-size:16px;"><span style="font-family: arial,helvetica,sans-serif;">You may experience the following error when you attempt to open your web application:</span></span><br>&nbsp;</div><div style="margin-left: 40px;"><span style="font-size:16px;"><span style="font-family: arial,helvetica,sans-serif;"><span style="font-family:courier new,courier,monospace;"><strong>Description:</strong> An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.<br>&nbsp;<br>&nbsp;<strong>Parser Error Message:</strong> Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.</span></span></span><br>&nbsp;</div><div><span style="font-size:16px;"><span style="font-family: arial,helvetica,sans-serif;">The error indicates that your account is configured to run with an ASP.NET framework version that may not match your application framework.<br>&nbsp;<br>&nbsp;To resolve the problem simply go to the ASP.NET Version page in Control Panel to switch the framework.</span></span></div>