Level 3 Advanced Training - UiDemo help

I’m stuck at Process.xaml - This is the 1st of the Level 3 Advanced training using UiDemo app.
Please, see uploaded file. ProcessUiDemo.xaml (16.9 KB)

I can’t find any docs or samples of how to solve it. Can anyone point me in the right direction?

Thank you.

HI @mario_w

What exactly is the problem you are facing?

I think I did everything like in the pdf and now there is exception (see screenshots), which says "Compiler Error, cannot convert queueitem to string.
Tried also something different, like in_argument.SpecificContent(“CashIn”).ToString and after that received
“Object reference not set to an instance of an object.”

No, I didnt.