微软企业库的缓存使用——Caching引用&配置后总报错

使用微软企业库框架，用的是最新版的Microsoft Enterprise Library 5.0，配置数据连接dataConfiguration和缓存使用cachingConfiguration~
1，只配置数据连接能正常存取数据，但是加上cachingConfiguration的配置节后，一直报错
网上搜了N多变都解决不了，求大家指导下！！！报错截图：
配置代码：<?xml version="1.0"?><configuration>
  <configSections>    <section name="dataConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Data.Configuration.DatabaseSettings, Microsoft.Practices.EnterpriseLibrary.Data, Version=5.0.414.0, Culture=neutral, PublicKeyToken=null" />    
    <section name="cachingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings, Microsoft.Practices.EnterpriseLibrary.Caching, Version=5.0.414.0, Culture=neutral, PublicKeyToken=null" requirePermission="true" />
  </configSections>  <connectionStrings configSource="Config\\Database.config" />
  <appSettings />
  
  
  <!--缓存配置-->
  <cachingConfiguration defaultCacheManager="Cache Manager">
    <cacheManagers>
      <add name="Cache Manager" type="Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager, Microsoft.Practices.EnterpriseLibrary.Caching, Version=5.0.414.0, Culture=neutral, PublicKeyToken=null"
          expirationPollFrequencyInSeconds="60" maximumElementsInCacheBeforeScavenging="1000"
          numberToRemoveWhenScavenging="10" backingStoreName="NullBackingStore" />
    </cacheManagers>
    <backingStores>
      <add type="Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.NullBackingStore, Microsoft.Practices.EnterpriseLibrary.Caching, Version=5.0.414.0, Culture=neutral, PublicKeyToken=null"
          name="NullBackingStore" />
    </backingStores>
  </cachingConfiguration></configuration>