The DotNetNuke 5.0.0 portal alias module error in the image below is a DNN bug that will be resolved once 5.0.1 is released you will need to upgrade to 5.0.1 version if your DNN portal has this error.

Bug Tracker info: http://support.dotnetnuke.com/issue/ViewIssue.aspx?ID=9025&PROJID=2DotNetNuke 4.x