How can you identify where an error came from using Cavan App monitor?

Question

I am debugging a canvas app and have turned to the app monitor for help, it seems like a good place to start, it shows errors that I could go and fix but rarely shows the broken function or the control which houses it

Many of the controls are hidden and just used to store values that are then used to pick records which are then used visibly in the app. How am I expected to bridge the gap between "There was an error in the Value function" and where the error is so I can do something/anything about it?