Could not load file or assembly log4net Version=1.2.10.0

<configsections>
   <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net,Version=1.2.10.0, Culture=neutral, PublicKeyToken=1B44E1D426115821" />
 </configsections>

<log4net>
    <!-- Define some output appenders -->
    <appender name="RSServiceFileLogAppender" type="log4net.Appender.RollingFileAppender">
      <file value="C:\RSService\RSServiceLogs_" />
      <staticlogfilename value="false" />
      <appendtofile value="true" />
      <rollingstyle value="Date" />
      <datepattern value="yyyy-MM-dd.LOG" />
      <lockingmodel type="log4net.Appender.FileAppender+MinimalLock" />
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%d %-5p %m%n" />
      </layout>
      <filter type="log4net.Filter.LevelRangeFilter">
        <levelmin value="INFO" />
        <levelmin value="DEBUG" />
        <levelmax value="ERROR" />
      </filter>
    </appender>
    <!-- Define some output appenders -->
    <appender name="RSServiceConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <mapping>
        <level value="ERROR" />
        <forecolor value="Red" />
      </mapping>
      <mapping>
        <level value="DEBUG" />
        <forecolor value="HighIntensity" />
      </mapping>
      <mapping>
        <level value="INFO" />
        <forecolor value="Green" />
      </mapping>
      <mapping>
        <level value="WARN" />
        <forecolor value="Yellow" />
      </mapping>
      <mapping>
        <level value="FATAL" />
        <forecolor value="White" />
        <backcolor value="Red" />
      </mapping>
      <layout type="log4net.Layout.PatternLayout">
        <param name="ConversionPattern" value="%d [%t] %-5p %c %m%n" />
      </layout>
      <filter />
    </appender>
    <!-- Setup the root category, add the appenders and set the default level
             ALL
             DEBUG
             INFO
             WARN
             ERROR
             FATAL
             OFF
          For example, setting the threshold of an appender to DEBUG will also allow INFO,
          WARN, ERROR and FATAL messages to log along with DEBUG messages. (DEBUG is the
          lowest level). This is usually acceptable as there is little use for DEBUG
          messages without the surrounding INFO, WARN, ERROR and FATAL messages.
          Similarly, setting the threshold of an appender to ERROR will filter out DEBUG,
          INFO and ERROR messages but not FATAL messages.-->
    <root>
      <level value="ALL" />
      <appender-ref ref="RSServiceFileLogAppender" />
    </root>
  </log4net>