من از ادیتور استفاده میکنم و زمانی که بروی دکمه عکس خود ائیتور کلیک میکنم و میخوام عکس اضاف کنم اخطار زیر میده

اینم کد Web config

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <connectionStrings>
    <add name="cmsConnectionString" connectionString="Data Source=.;Initial Catalog=cms;Integrated Security=true;MultipleActiveResultSets=True" providerName="System.Data.SqlClient" />

  </connectionStrings>
  <appSettings>
    <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
    <add key="Telerik.ScriptManager.TelerikCdn" value="Disabled" />
    <add key="Telerik.StyleSheetManager.TelerikCdn" value="Disabled" />
  </appSettings>
  <system.web>
    <httpRuntime requestValidationMode="2.0" maxRequestLength="2000000000" executionTimeout="999999" />
    <httpModules>
      <add type="WhitespaceModule" name="WhitespaceModule" />
    </httpModules>
    <sessionState cookieless="UseCookies" regenerateExpiredSessionId="true" mode="InProc" timeout="100" />
    <authentication mode="Forms">
      <forms loginUrl="Default.aspx" />
    </authentication>
    <compilation debug="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="System.Speech, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
        <add assembly="Microsoft.Web.Infrastructure, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
        <add assembly="System.Management, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="System.Security, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />
        <add assembly="System.Data.Entity.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
      </assemblies>
    </compilation>

    <!--<customErrors mode="On" defaultRedirect="pages/404.aspx"></customErrors>-->
    <trace enabled="false" localOnly="true" />
    <httpCookies httpOnlyCookies="true" />
    <customErrors mode="Off" />
    <httpHandlers></httpHandlers>
  </system.web>
  <system.webServer>

    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true" />

    <handlers>
      <add name="Telerik_Web_UI_DialogHandler_aspx" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" />
      <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" />
      <add name="Telerik_Web_UI_SpellCheckHandler_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" />


    </handlers>
  </system.webServer>
</configuration>