Error when opening worklist item

I am getting the message "Worklis titem could not be opened. 2411 K2:username from ipaddress is not allowed to open the worklist item with SN=69-31.

I have gone into the management console and made sure that Domain Users has Start and View rights in the Process Rights section of the workflow.

The Details of the error message are below, any suggestions?

• Type:

  ClientException

• Source:

  SourceCode.Workflow.Client

• Method Base
  • Member Type:

    Method

  • Name:

    Call

  • Module
    • Scope Name:

      SourceCode.Workflow.Client.dll

  • Declaring Type
    • Full Name:

      SourceCode.Workflow.Client.InternalConnection

• Stack Trace:

  
  at SourceCode.Workflow.Client.InternalConnection.Call(ArchiveX ar, MessageType msgtype)
  
  at SourceCode.Workflow.Client.Connection.OpenWorklistItem(String SerialNumber, String Platform, Boolean Alloc, Boolean IgnoreStatus, String ManagedUser)
  
  at SourceCode.Forms.AppFramework.FormRuntime.GetWorkListItem(Connection workflowConnection, String serialNumber, String sharedUser, String managedUser, Boolean offline)
  
  at SourceCode.Forms.AppFramework.FormRuntime.LoadProcessInfo(String type, String value, String sharedUser, String managedUser, Boolean offline)