Objective

The following error may appear when appifying a SharePoint list if the lookup column references list with no Item content type.

"SmartObject Server Exception: Error refreshing Service Instance 'portal_denallix_com'. Service returned: 'Value cannot be null. Parameter name: k2List '."

Before You Begin

Currently lists without a content type being referenced as lookup column is not supported. Please see the following reference for supported SharePoint artifacts:
http://help.k2.com/onlinehelp/k2forsharepoint/userguide/current/default.htm#About_K2_for_SharePoint/CompatSecPermConsid/Supported_and_Unsupported_Artifacts.htm%3FTocPath%3DAbout%2520K2%2520for%2520SharePoint%7C_____3

How-to Steps

Adding OOB SharePoint "Item" content type to the list being referenced in the lookup column will allow the list to be appified successfully.