Need Help on Error

In my app, I want to do: when user click on LIKE button, then like count is Increase once, but user are not allow to like more then 1 time. so I use Below Blocks, But I Got an Error. Is anyone please help me to fix this issue?


Why are you creating a list, directly add 1 in the global like so the like count will be increased by 1.

Or else you are trying to get something other then explain properly what you want.

I Created List Because, Any User only like other user to 1 time only.