Error : '<', hexadecimal value 0x3C, is an invalid attribute

Question

//here is my code

 

<?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>

<appSettings>

<add key="ValidationSettings:UnobtrusiveValidationMode" value="WebForms" />

<add key="ValidationSettings:UnobtrusiveValidationMode" value="WebForms" />

</appSettings>

<connectionStrings>

<add name="centralwebConnectionString" connectionString="Data Source=localhost;Initial Catalog=centralweb;Integrated Security=True" providerName="System.Data.SqlClient"/>

</connectionStrings>

<system.web>

<compilation debug="true" targetFramework="4.5>

<assemblies>

<add assembly="Microsoft.JScript, Version=10.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>

</assemblies>

</compilation>

<httpRuntime targetFramework="4.5"/>

</system.web>

<appSettings>

<add key="validationSettings: UnobtrusiveValidationMode" value="None"/>

</appSettings>

</configuration>