Server Error in '/' Application.

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Line 15:         lianxi = new ZZY.BLL.xp_articles().GetModel(5).contentsEn;
Line 16: 
Line 17:         this.Rep_ProductList.DataSource = new ZZY.BLL.xp_procategory().GetList(" parentid = 1 and menuid = 54");
Line 18:         this.Rep_ProductList.DataBind();
Line 19:     }

[Exception: 不能使用 ''；文件已在使用中。]
   DbHelperOleDb.Query(String SQLString) in J:\2017-12\9159金莎游艺场\9159金莎游艺场\52新双语\DBUtility\DbHelperOleDb.cs:146
   ZZY.DAL.xp_procategory.GetList(String strWhere) in J:\2017-12\9159金莎游艺场\9159金莎游艺场\52新双语\DAL\xp_procategory.cs:291
   ZZY.BLL.xp_procategory.GetList(String strWhere) in J:\2017-12\9159金莎游艺场\9159金莎游艺场\52新双语\BLL\xp_procategory.cs:88
   Control_Footer.Page_Load(Object sender, EventArgs e) in d:\ekemWeb\ekemWeb\en\Control\Footer.ascx.cs:17
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Control.LoadRecursive() +146
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207