5 Steps to Isolate Causes When GAS or Python Won't Run (Including When There's No Error but the Numbers Don't Match)

When Google Apps Script (GAS) or Python scripts don't work, the most time-consuming part is the time spent not knowing what ...

When you run it by double-clicking, the error disappears in an instant

The moment I double-click, a black screen flashes and disappears immediately. I can't even tell if an error occurred or if it ...