Unable to Enter a License Key or Create a Repository after a Core Installation (4035202)

After installing a new Core, users are unable to enter the Core license key (or, if they key was entered, users are unable to create a new repository).

The following error also appears in the web browser:

“Method not found: ‘Int32 System.Web.Util.AppSettings.get_MaxJsonDeserializerMembers()’.”

This error may be the result of issues within .Net 4.0.

To resolve this issue, complete the following steps.

• Stop the Core Service.
• Install Microsoft KB 2656351 (found here). Note that a reboot may be required.
• Navigate to c:\program files\AppRecovery\core\core service\coreadmin and find the web.config file.
• Open Web.config with Notepad and search for the <appSettings> tag. Add the following keys under the <appSettings> tag:
• <add key=”aspnet:MaxJsonDeserializerMembers” value=”2000000″/>
• <add key=”aspnet:MaxHttpCollectionKeys” value=”2000000″ />
• Restart the Core Service (or, if you did not reboot after installing KB2656351, reboot).