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Cannot view webpart in browser after adding Group Properties

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :C#

Ihave a customized web part, this can be shown properly in browser.

however, in the dataview, if I added "Collapse group by default ", it looks fine in sharepoint designer. But, when it goes to browser. i got the following error:

Unable to display this Web Part. To troubleshoot the problem, open this Web page in a Windows SharePoint Services-compatible HTML editor such as Microsoft Office SharePoint Designer. If the problem persists, contact your Web server administrator.

Please help ! ! !

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