Thought I would mention this because it took a while for me to fix this issue and I couldn't find the answer anywhere on SO. The code I was working on worked for a co-worker but not for me (I was getting this same error). It worked for me in Chrome, but not in Edge.
I was able to get it working by clearing the cache in Edge.
This may not be the answer to this specific question, but I thought I would mention it in case it saves someone else a little time.