solr getinstance is null

我使用solr在文档上创建索引。从我的visual studio运行web应用程序时，一切都很好。但在生产服务器上，我得到了一个错误：

   Object reference not set to an instance of an object

这是堆栈跟踪

at Microsoft.Practices.ServiceLocation.ServiceLocator.get_Current() in        
  c:'Home'Chris'Projects'CommonServiceLocator'main'Microsoft.Practices.ServiceLocation'ServiceLocator.cs:line 17
  at Fusion.Search.IndexManagerBase`1.GetSolrOperations() in C:'code'src'Fusion.Search'IndexManagerBase.cs:line 42
  at Fusion.Search.IndexManagerBase`1.AddFile(String fileName, Stream file, T doc, Boolean commit) in C:'code'src'Fusion.Search'IndexManagerBase.cs:line 97
  at Fusion.Search.IndexManagerBase`1.AddFile(String fileName, Stream file, T doc) in C:'code'src'Fusion.Search'IndexManagerBase.cs:line 92
  at Fusion.Search.Recruitment.CVStore.AddCV(String fileName, Stream cv, CVDocument doc) in C:'code'src'Fusion.Search'Recruitment'CVStore.cs:line 56

发生错误的代码

 public ISolrOperations<T> GetSolrOperations()
    {
        return ServiceLocator.Current.GetInstance<ISolrOperations<T>>();
    }

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