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If you have more than one SharePoint Central Admin site the AdminResource.resx does not get installed on each of these sites. An "Unknown error" is displayed when clicking on the K2 for SharePoint tab.
This hotfix repairs the error that may occur when extending the existing SharePoint Central Administration site.
When opening SharePoint Central Administration > Application Management > Create or extend Web application > Extend an existing Web application
click on the "Web Application:" drop-down and select "Change Web Application" from the drop-down menu. Click on the "SharePoint Central Administration v3" link and click on the OK button.
The "Unknown Error" message will be displayed when you open the extended SharePoint Central Administration site and click on the K2 for SharePoint tab.
This Hotfix is contained within the latest K2 blackpearl 0807 Update. Install the update package to resolve the error.
The latest K2 blackpearl 0807 Update is available as an independent installation package which can be found here: https://portal.k2.com/downloads/bp/default.aspx