Symptoms
I'm getting an error message when trying to access any of the K2 for SharePoint management features via the central admin. Please see the attached screenshot.
Diagnoses
K2 for SharePoint 2013 can be managed thru each site and on each object that it has applied. This running the registration wizard on the site and using the K2 Workflow for each list or document library to create the K2 Application.
Resolution
Getting into the Site Contents - K2 For SharePoint settings resolved the issue. K2 For SharePoint on Central Admin is for K2 For SharePoint 2010 or 2013 running under 2010 mode sites.