Your query returned a greater number of results than the web application's query throttling limit. Please adjust the configuration of this Web Part or increase the throttling limit.

Generally the error occurs when the list has reached the threshold limit (5K by default).

You can always increase the throttling limit for a particular list.

http://blogs.msdn.com/b/dinaayoub/archive/2010/04/22/sharepoint-2010-how-to-change-the-list-view-threshold.aspx[^]

However, I would not advice that and instead look to add more applicable filters which you can use.

If you cannot bend the rule, you have to abide. So if you cannot change the throttling limit, you should apply filters. E.g. get results in batches of 30 days