I keep getting this error I don't know why as my web part sometimes work just fine and other display this message

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.

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    Can you check the ULS log and post any relevant log entries. This info is not sufficient to help your issue Mar 25 '18 at 6:50

I found some forums relating the same problem. If you are working in SharePoint 2010:

Was installed in Windows Server 2008 R2 Service Pack 1 the KB2844286 Security Update.

To fix it you can unistall KB2844286 or you can install an update in


More information:


If you are working with SharePoint 2013, take a look at the following article:


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