Groovy issue

[Jorge99]

Hello experts

I am learning groovy to use it in Iflows configuration
I installed the GroovyConsole editor on my machine

I am testing with the next script

But when i run the script, the system is sending the next error:

unable to resolve class com.sap.gateway.ip.core.customdev.util.message

Do you know how to solve this issue?

Thanks in advanced