Running into errors? I was running into this error with my WebGL build. I found this forum and was able to fix it: https://forum.unity.com/threads/solved-webgl-build-error-unable-to-parse-build-f...
In my case it was one of the file format settings that I had to change 'Project Settings > Player > WebGL > Publishing Settings > Compression Format'. > Gzip
I hope that can help you.