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Error during upgrade attempt from K2 4.7 to K2 Five: "Invalid Archive Type, Method not found, GetSessionPrimaryCredentials"

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 an upgrade attempt from K2 4.7 to K2 Five, if cancelling out of the update/upgrade manager (before the upgrade process actually starts); this can cause the current K2 4.7 sites and other K2 areas to stop functioning. The following errors may be seen in different areas:

Method not found: 'SourceCode.Hosting.Server.Interfaces.ICredential SourceCode.Hosting.Server.Interfaces.ISecurityManager.GetSessionPrimaryCredentials(System.String)'.

Invalid Archive Type

Example scenarios that could result in this situation includes:

- Running the K2 Five Setup Manager, seeing components currently installed on the server, then canceling out.

- Running the K2 Five Setup Manager to get the SystemKey to request LicenseKey, but then canceling out.

- Running the K2 Five Setup Manager with the intention to upgrade, when a warning is thrown regarding K2 Role(s) that makes use of SmartObject members; forcing you to cancel out of the wizard to address the issue first before it will allow you to proceed (https://help.k2.com/kb002145).


This is a known issue due to the K2 Five update/upgrade manager replacing certain 4.7 assemblies with K2 Five upgrade assemblies in the K2 Blackpearl directory and the GAC, but failing to revert them on cancellation.

Assemblies includes:

- SourceCode.HostClientAPI.dll
- SourceCode.HostServerInterfaces.dll
- SourceCode.TCPIOCPService.dll
- SourceCode.HostServerLib.dll


1. A fix/workaround is available and can be obtained by logging a Support ticket. 

2.  If a virtual machine (VM) snapshot was created of the K2 server prior to the upgrade attempt, reverting the snapshot should restore operation.

3.  Perform a repair of K2 Blackpearl 4.7 and re-apply any CU/FP as needed.