Issue Description

When you attempt to start a K2 Workflow using the REST API, an error occurs.

Error Message

The following error occurs: “An item with the same key has already been added”.


  1. Ensure you have K2 Five (5.2) installed.
  2. Download the K2 Five (5.2) FP24 from K2 Partner and Customer Portal.
  3. Install the K2 Five (5.2) FP24 to apply the fix.