Loop with exclusive gateway

Hi,
I’m creating the process with loop and exclusive gateway, and I have two tasks. In the first one user1 insert some string (title1), and the second task, the second user read that input and type his title2. And then I want to pass that title2 back to task1 (to user1) who will be able to read that title2. I’ll try to put default value ${input2} to new form field into task 1, but error said: Cannot resolve identifier ‘input2’. I’m only using Camunda Modeler, how can I resolve this?
Here is my example.

Regards
Sandra