Parser Error Message: Unrecognized configuration section log4net/appender.

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web.config

I have following web.config (let me send piece of code from web.config)

<configSections>
   <sectionGroup name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
 </configSections>
   <log4net debug="true">
       <appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
           <file value="C:\\TestProj\\TestLog.txt"/>
           <appendToFile value="true"/>
           <rollingStyle value="Size"/>
           <maxSizeRollBackups value="10"/>
           <maximumFileSize value="2KB"/>
           <staticLogFileName value="true"/>
           <layout type="log4net.Layout.PatternLayout">
               <conversionPattern value="%-5p %d %5rms %-22.22c{1} %-18.18M - %m%n"/>
           </layout>
       </appender>
       <root>
           <level value="DEBUG"/>
           <appender-ref ref="RollingLogFileAppender"/>
       </root>
   </log4net>
   <configSections>

and its giving an error
Parser Error Message: Unrecognized configuration section log4net/appender.