@mimostel
I know you already solved your issue but I wanted to highlight something which should save you from creating lots of variables.
The variables inside the loops and parameters of functions are special type of variables.
You do not need to created app variables to use them as loop number holders.
When you add a loop block you can click on the variable to rename it like this,
Now you have a variable for the loop and is available as the name only without the app variable proceeding it.