AX crashes while creating expense workflow document

When I try to create expense workflow the AX crashes.

 Error

“Application: Ax32.exe

Framework Version: v4.0.30319

Description: The process was terminated due to an unhandled exception.

Exception Info: System.Collections.Generic.KeyNotFoundException

Stack:

   at Microsoft.Dynamics.AX.Framework.Workflow.Model.MessageTextProperty.Create(Microsoft.Dynamics.AX.Framework.MetaModel.DesignElement, System.String, System.String) “

I am using feature pack, kernel version 6.0.947.862. Any help would be appreciated