I have created a group with a couple of variables, each one has a script that does a specific job. ( In this case it uppercases the text )

Each variable holds a Value like this :

The Process inside the Group has the following configurations

I'm making a reference to the PG variable, but i'm unsure about the Script Body, mine is
the following:

The code is giving me an error. I'm stuck.
What am I doing wrong.