Hello everyone!

I need to search through all of the records in my Module and show only those who do not have my parameter "License":

Link for this code: 

The code:

 paramInstance.Add(SearchRecordsParam.CRITERIA, "((Last_Name:starts_with:Last Name)"

How can I make it for my licenses?

paramInstance.Add(SearchRecordsParam.CRITERIA, "(License:starts_with:null))");

I'm getting status code: 204 - No content.

Thank you in advance!