Set default value for argument of type queue item (UiPath.Core.QueueItem)

I am trying to set a default value for an argument of type queue item (UiPath.Core.QueueItem) so I can test/debug my file without running the whole project because it takes longer to do that. I get an error that reads

“Compiler error(s) encountered processing expression…End of expression expected”.

What is the proper syntax to use for a queue item? I can’t upload actual files with business data but I’ve attached a very simple script with similar process and image below

Main.xaml (4.3 KB)

Can anyone help with this error?