This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice This article is not considered official documentation for K2 software and is provided “as is” with no warranties.
During App Deployment, a .NET Framework error message at the K2 Server URL screen appears when you click the Next or Test button.
System.NullReferenceException: Object reference not set to an instance of an object.
at SourceCode.SetupManager.UI.Panels.MetaDataDocUrlPanel.Sha512Incompatibility(String url)
The K2 App Deployment tool attempted to reach K2 AutoDiscover URL but the connection was terminated due to an invalid certificate. In this case, a special wildcard certificate was used during the initial K2 setup (internet connection is required to validate the certificate).
Allow internet access between K2 and SharePoint to resolve the issue.