Log4Net和userSettings结合导致配置问题

Question

我试图将log4net实现到我的项目，该项目也具有Settings.Default参数，但是在第一次调用任何系统Settings.Default参数时收到“配置系统初始化失败”错误。你们可以看看吗？谢谢！

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
      <section name="Order_Take_3._0.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
    </sectionGroup>
    <sectionGroup name="SectionGroupLogger">
      <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
    </sectionGroup>
  </configSections>
  <log4net>
    <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
      <layout type="log4net.Layout.PatternLayout">
        <conversationPattern value="%date{ABSOLUTE} [%thread] %level - %message%newline%exception" />
      </layout>
    </appender>
    <root>
      <level value="DEBUG" />
      <apender-ref ref="ConsoleAppender" />
    </root>
  </log4net>

  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2"/>
  </startup>
  <userSettings>
    <Order_Take_3._0.Properties.Settings>
      <setting name="AFEWDUS" serializeAs="String">
        <value>681124</value>
      </setting>
      <setting name="AFEKMTUS" serializeAs="String">
        <value>681625</value>
      </setting>
      <setting name="cloudReminderCountDown" serializeAs="String">
        <value>21</value>
      </setting>
      <setting name="orderConfirmationCheckCountDown" serializeAs="String">
        <value>3</value>
      </setting>
      <setting name="AFEKMTCa" serializeAs="String">
        <value>0</value>
      </setting>
      <setting name="AFEWDCa" serializeAs="String">
        <value>0</value>
      </setting>
    </Order_Take_3._0.Properties.Settings>
  </userSettings>
</configuration>