So, I am working my way through the Vue Official Guide. However, I am using Single File Components instead of the Vue Components that the examples use and have run into a snag on the Watchers section that I have been beating my head against my desk about--fatigue may be a contributing factor here. The issue is that I keep getting an error that says this.debouncedGetAnswer() is not a function. The result is that the watcher never actually finishes. Any help would be greatly appreciated.

https://codesandbox.io/embed/vueguideofficial-9ciyc