Symptoms
Error when using saved expressions inside an expression. In order to re-use the saved expressions on the project I am trying to build expressions with saved expression but iI am getting the below error, otherwise I have to retype the full expression several times.
Error: System.NullReferenceException: Object reference not set to an instance of an object.
Diagnoses
This has been identified as an issue. A TFS item has been logged.
Resolution
A workaround is to add more expressions and use logic operators. A TFS item has been created to address the behavior.