Symptoms

We have an On Prem Appit Environment. When we tried to make K2 artifacts we were receiving an error. The error mentions a missing MobileDisplayFormURL that is missing as a parameter. If we do not choose to use K2 Smartforms as the default SharePoint New/Edit/Display forms we do not get the error.
 

Diagnoses

This is an issue related to the CU for SharePoint. There is a parameter that was added to SharePoint in these CU's that was not here before, and Appit 1.5 uses it to get the Display form URL. 1.5 now requires the SharePoint server to be on the August 2016 CU at least.
 

Resolution

Updating the SharePoint server to the latest CU resolved the issue.