This error could occur during the WikiPlus migration from SharePoint 2007 to 2010 when the upgrade utility fails to update the existing WikiPlus pages/forms/masterpages. The failure is because of the WikiPlus pages/forms are un-ghosted(customized) and the upgrade utility does not upgrade any pages that are un-ghosted. This error is usually displayed on those pages and forms.
There is an error message when try to create/edit a WikiPlus page (See image below)
To resolve the issue, you would use SharePoint Designer to check if the WikiPlus pages/forms/masterpage are un-ghosted. You can see a blue information symbol in front of file which is un-ghosted (customized). To ghost it you would reset the site definition for the form/file.
There should be no references to KWizCom.SharePoint.WikiPlus.Pages.dll(WikiPlus 2007) just 'KWizCom.SharePoint.WikiPlus.dll (WikiPlus 2010)
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