对 COM 组件的调用返回了错误 HRESULT E_FAIL

        //打开Workspace

        public IWorkspace OpenWorkspace(string strGDBName)
        {
            IWorkspaceFactory workspaceFactory;

            workspaceFactory = new FileGDBWorkspaceFactoryClass();
            return workspaceFactory.OpenFromFile(strGDBName, 0);

        }
  执行到 return workspaceFactory.OpenFromFile(strGDBName, 0);
  提示：未处理 System.Runtime.InteropServices.COMException
  Message="对 COM 组件的调用返回了错误 HRESULT E_FAIL。"
  Source="ESRI.ArcGIS.DataSourcesGDB"
  
  对 COM 组件的调用返回了错误 HRESULT E_FAIL，又是什么问题呀，好纠结，
  希望大家能够给予指点，不胜感激！

补充：.NET技术 ,  C#