The link below fixed my error

http://www.dnnsoftware.com/wiki/activating-advanced-url-management

Basically it has to do with URL format

1. Open the web.config file, and search for 'urlformat'. You should find this in the section, like this:


add name="DNNFriendlyUrl" type="DotNetNuke.Services.Url.FriendlyUrl.DNNFriendlyUrlProvider, DotNetNuke.HttpModules" includePageName="true" regexMatch="[^a-zA-Z0-9 _-]" urlFormat="humanfriendly"



2. Change the urlFormat value to 'advanced', like this:


add name="DNNFriendlyUrl" type="DotNetNuke.Services.Url.FriendlyUrl.DNNFriendlyUrlProvider, DotNetNuke.HttpModules" includePageName="true" regexMatch="[^a-zA-Z0-9 _-]" urlFormat="advanced"

The change is where it says urlFormat= changed from "humanfriendly" to "advanced"
Save the web config and Bob's your uncle

Wayne