I am getting the same error for both ReportMangerURL and WebServiceURL.

Below is what Web.Config content is

<?xml version="1.0" encoding="utf-8"?>

<configuration>

<configSections>

<section name="MicrosoftWebControls" type="System.Configuration.NameValueSectionHandler, System, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL" />

<section name="UIConfig" type="Microsoft.ReportingServices.UI.UIConfigSectionHandler,ReportingServicesWebUserInterface" />

</configSections>

<system.net>

<defaultProxy enabled="false" />

</system.net>

<system.web>

<pages validateRequest="false" />

<compilation defaultLanguage="c#" debug="false" tempDirectory="C:\Program Files\Microsoft SQL Server\MSRS11.MS2012\Reporting Services\RSTempFiles\" />

<customErrors mode="RemoteOnly" />

<authentication mode="Windows" />

<identity impersonate="true" />

<trace enabled="false" requestLimit="10" pageOutput="false" traceMode="SortByTime" localOnly="true" />

<sessionState mode="InProc" cookieless="false" timeout="20" />

<globalization requestEncoding="utf-8" responseEncoding="utf-8" />

<httpRuntime executionTimeout="9000" />

<securityPolicy>

<trustLevel name="RosettaMgr" policyFile="rsmgrpolicy.config" />

</securityPolicy>

<trust level="RosettaMgr" originUrl="" />

<httpHandlers>

<add verb="*" path="Reserved.ReportViewerWebControl.axd" type="Microsoft.Reporting.WebForms.HttpHandler, ReportingServicesWebUserInterface, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />

<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false" />

</httpHandlers>

<httpModules>

<clear />

<add name="OutputCache" type="System.Web.Caching.OutputCacheModule" />

<add name="WindowsAuthentication" type="System.Web.Security.WindowsAuthenticationModule" />

<add name="FormsAuthentication" type="System.Web.Security.FormsAuthenticationModule" />

<add name="PassportAuthentication" type="System.Web.Security.PassportAuthenticationModule" />

<add name="RoleManager" type="System.Web.Security.RoleManagerModule" />

<add name="UrlAuthorization" type="System.Web.Security.UrlAuthorizationModule" />

<add name="FileAuthorization" type="System.Web.Security.FileAuthorizationModule" />

<add name="AnonymousIdentification" type="System.Web.Security.AnonymousIdentificationModule" />

<add name="Profile" type="System.Web.Profile.ProfileModule" />

<add name="ErrorHandlerModule" type="System.Web.Mobile.ErrorHandlerModule, System.Web.Mobile, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />

</httpModules>

</system.web>

<appSettings>

<add key="ReportViewerServerConnection" value="Microsoft.ReportingServices.UI.WebControlConnection, ReportingServicesWebUserInterface, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />

<add key="ReportViewerTemporaryStorage" value="Microsoft.ReportingServices.UI.ReportViewerTemporaryStorage, ReportingServicesWebUserInterface, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />

</appSettings>

<runtime>

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

<dependentAssembly>

<assemblyIdentity name="Microsoft.ReportingServices.Interfaces" publicKeyToken="89845dcd8080cc91" culture="neutral" />

<bindingRedirect oldVersion="8.0.242.0" newVersion="11.0.0.0" />

<bindingRedirect oldVersion="9.0.242.0" newVersion="11.0.0.0" />

<bindingRedirect oldVersion="10.0.0.0" newVersion="11.0.0.0" />

</dependentAssembly>

</assemblyBinding>

</runtime>

</configuration>