Do some debugging. Break your event blocks down to one action at a time to find where the problem is. You should be able to do most, if not all with companion app, without swearing
It's difficult to tell without the exact error message, but looking at the code "element 2" is most likely global channelA as it's the second element to the + operator and could be something other than a number. What is the value of global channelA?
I dont have any code, where do I get one to connect to my app or whatever it is supposed to do ?
also I dont have the same screen as you, I might have installed the wrong app
why is this so cryptic ?.
Also, for debugging, can you grab that thumbposition and drop it into a global variable, to make it available to a Do It later on?
That would help capture the Make a List value in a Do It working off persistent global variables.