Thank's Sean.

But, "$ZF(-1)" is not return result of execution command.

You see in documentation:
"$ZF(-1) does not return operating system command results"

https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY...

In portal administration is possible visualize your error.

Operation -> System Log -> Log of errors the application.

Errors are stored in the error namespace caused;