[xwiki-users] Broken links

Hi again, I wanted to create a space for making notes for myself about administrating xwiki. As admin, I created new space, and wanted to add a link to XWikiPreferences. I clicked Edit, to edit the page. I clicked Link, to add a link to another page. I expanded XWiki, but did not find XWikiPreferences I typed in XWikiPreferences (see screenshot), and it seemed to work fine - it found its child pages too I clicked select, and then I saw what you see in the screenshot - a "DocumentDoesNotExist" returned and squashed into a small box. what happened? thanks Paul