Link Browser error

I am trying to use CKEditor and CKFinder on Joomla 1.6. The editor works fine but the CKFinder Link Browser causes errors when trying to select a page from the Link Browser tree. The tree does not appear to construct itself correctly as it duplicates tree items under different parents. Also when selecting a tree itme the errors are always the same, it produces multiple occurrances of:

Undefined property: stdClass::$nameError in line 63 of file C:\\wamp\\www\\test.domain.org\\plugins\\editors\\ckeditor\\plugins\\linkBrowser\\extensions\\links\\joomlalinks\\menu.php

and

Undefined property: stdClass::$nameError in line 90 of file C:\\wamp\\www\\test.domain.org\\plugins\\editors\\ckeditor\\plugins\\linkBrowser\\extensions\\links\\joomlalinks\\menu.php

Any help much appreciated.