Issue Description

When you upgrade from K2 Five RTM to K2 Five (5.1), an error occurs when you execute the List All Worklist Items method from any existing Service Broker that uses the K2 Management Workflow API.

Error Message

The following error occurs: “Value cannot be null. Parameter name:name”.


  1. Ensure you have K2 Five (5.1) installed.
  2. Download the K2 Five (5.1) FP15 from K2 Partner and Customer Portal.
  3. Install the K2 Five (5.1) FP15 to apply the fix.
  4. It is recommended to clear the browser cache.