[URGENT] Unable to launch asp.net web application

[ConfigurationErrorsException: The value of the property 'type' cannot be parsed. The error is: The type 'Common.Services.FeatureAuthorizationManager, Common.Services' cannot be resolved. Please verify the spelling is correct or that the full type name is provided.]    System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult) +176    System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject) +1134    System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject) +1568    System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject) +1568    System.Configuration.BaseConfigurationRecord.GetSection(String configKey) +41    System.Web.HttpContext.GetSection(String sectionName) +52    System.Web.Configuration.HttpConfigurationSystem.GetSection(String sectionName) +56    System.Web.Configuration.HttpConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String configKey) +11    System.IdentityModel.Configuration.SystemIdentityModelSection.get_Current() +95    System.IdentityModel.Services.Configuration.FederationConfiguration.GetIdentityConfigurationName(FederationConfigurationElement element) +79    System.IdentityModel.Services.Configuration.FederationConfiguration.LoadConfiguration(FederationConfigurationElement element) +308    System.IdentityModel.Services.Configuration.FederationConfiguration..ctor(Boolean loadConfig) +97    System.IdentityModel.Services.FederatedAuthentication.CreateFederationConfiguration() +72    System.IdentityModel.Services.FederatedAuthentication.get_FederationConfiguration() +87    System.IdentityModel.Services.HttpModuleBase.Init(HttpApplication context) +57    System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +534    System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +172    System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +352    System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +296  [HttpException (0x80004005): The value of the property 'type' cannot be parsed. The error is: The type 'Common.Services.FeatureAuthorizationManager, Common.Services' cannot be resolved. Please verify the spelling is correct or that the full type name is provided.]    System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +9947444    System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +101    System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +261