Content Query Web Part Error

I get the following error when I try to add a ContentByQuery.webpart in my SharePoint site.

"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."

I wonder about this error because this error is not coming in another web application on the same system.

So I started investigating what should be the problem.

Means while I come to know that content query webpart is also not available in the “Add webpart Dialog”.

Then I came to know that this Content Query webpart is the part of
“Office SharePoint Server Publishing Infrastructure Feature“

So I resolved the error by activating this feature. This feature is rested in site collection feature.

And Content Query webpart is also available in the webpart pool.