You are using the “Score Tracker” variable to call your “Set Text” function.
Right now your “Score Tracker” variable is empty meaning the Editor will throw an error because you try to call a function of “none”.
Basically you’re trying to fill up a bucket but you only have a piece of paper telling you where to find the bucket. However someone forgot to write down where it should be so you just hold that piece of paper under the flowing water which seems to not be too effective.