Login to Central Designer Fails with "Error in Reading Registry" Message (Doc ID 2237426.1)

System.InvalidOperationException: Client found response content type of 'text/plain; charset=utf-8', but expected 'text/xml'.

The request failed with the error message:

System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.Exception: Error reading registry key. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at PhaseForward.Designer.Shared.Startup.EncryptionKeyProvider.ReadEncryptionValues(Byte[]& key, Byte[]& iv) in c:\ICEDesigner\Shared.Client-Server\SharedCore\Startup\EncryptionKeyProvider.cs:line 94
--- End of inner exception stack trace ---
at PhaseForward.Platform.Configuration.ConfigurationReader..ctor(String fileName, String application) in C:\ICEPlatform\Core\Configuration\ConfigurationReader.cs:line 163
at PhaseForward.Platform.Configuration.Config.GetApplicationConfigurationReader(String application) in C:\ICEPlatform\Core\Configuration\Configuration.cs:line 634
at PhaseForward.Platform.Diagnostics.LoggerConfig..ctor() in C:\ICEPlatform\Core\Diagnostics\Types\LoggerConfig.cs:line 44
at PhaseForward.Platform.Configuration.Application.set_Name(String value) in C:\ICEPlatform\Core\Configuration\Application.cs:line 145
at PhaseForward.Platform.Configuration.Application.VerifyApplicationName() in C:\ICEPlatform\Core\Configuration\Application.cs:line 328
at PhaseForward.Platform.Configuration.Application.get_Name() in C:\ICEPlatform\Core\Configuration\Application.cs:line 65
at PhaseForward.Platform.Application.get_Name() in C:\ICEPlatform\Core\Application.cs:line 0
at PhaseForward.Platform.Security.SecurityConfigurationUtil.GetObjectFromConfiguration(String nodeName) in C:\ICEPlatform\Core\Security\SecurityConfigurationUtil.cs:line 86
at PhaseForward.Platform.Security.Client.WindowsPrincipalProvider.get_Provider() in C:\ICEPlatform\Core\Security\Client\WindowsPrincipalProvider.cs:line 39
at PhaseForward.Platform.Security.Authentication.TokenExtractionExtension.ExtractTokenFromHeader() in C:\ICEPlatform\WebServer\Security\Authentication\TokenExtractionExtension.cs:line 297
at PhaseForward.Platform.Security.Authentication.TokenExtractionExtension.ProcessMessage(SoapMessage message) in C:\ICEPlatform\WebServer\Security\Authentication\TokenExtractionExtension.cs:line 269
at System.Web.Services.Protocols.SoapMessage.RunExtensions(SoapExtension[] extensions, Boolean throwOnException)
at System.Web.Services.Protocols.SoapServerProtocol.CreateServerInstance()
at System.Web.Services.Protocols.WebServiceHandler.Invoke()
at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()
--- End of inner exception stack trace ---