1 问题
1> 在sharepoint中的，日期控件(DateTimeControl)，日期过滤控件(Date Filter)和SPListViewFilter等包含日期组件的控件，在特定情况下会报以下的错误
2> 我们查看下具体错误信息是：
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] Microsoft.SharePoint.Utilities.SPUtility.GetThemedImageUrl(String originalUrl, String themeKey) +199 Microsoft.SharePoint.WebControls.DatePicker..ctor() +1460 Microsoft.SharePoint.WebControls.SPDatePickerControl.InitDatePicker() +44 Microsoft.SharePoint.WebControls.SPDatePickerControl.set_MinJDay(Int32 value) +25 Microsoft.SharePoint.ApplicationPages.DatePickerFrame.Page_Load(Object sender, EventArgs e) +1708 System.EventHandler.Invoke(Object sender, EventArgs e) +0 System.Web.UI.Control.LoadRecursive() +94 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2935
2 解决方案
以上错误只有在具特殊的路径的网站集合才会发现（如：http://localhost:8088/sites/TEST/）
在当前的端口下创建一个根网站集合即可解决问题（如 http://localhost:8088)
原文：http://www.cnblogs.com/dataadapter/p/4561052.html