Unable to display this Web Part. xxxxxx

​An error message shows up in the web part page:

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

Correlation ID:dad85696-26a1-4766-9f30-b480dd32a70a


Solution:

​One possible reason for this error is a windows update, the ID is Windows KB2844286.

The solution is to uninstall the updates.


Reference:

​​http://social.technet.microsoft.com/Forums/sharepoint/en-US/871a0661-05d0-4f3a-b66d-2504552142bd/error-while-executing-web-part-systemnullreferenceexception-object-reference-not-set-to-an 

Applies for: SharePoint 2010

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