Symptoms

K2 Designer Workflow Corrupted
 

Diagnoses

One of the workflows built by another power user got corrupted and the error attached shows up when opening the workflow

Exception:
(Arg_NullReferenceException)
Arguments:
Debugging resource strings are unavailable. Often the key and
arguments provide sufficient information to diagnose the problem. See
http://go.microsoft.com/fwlink/?linkid:ID66E3andVersionz5.1.41212.DOand
NullReferenceException

 

Resolution

It may be good idea to try and roll back the workflow to a previous version state and see if you can open the workflow.

You can use the following KB to have a look at this.

http://help.k2.com/onlinehelp/k2blackpearl/userguide/4.6.9/webframe.html_rollback_workflow.html