Failed to parse SourceMap

Ran in to this issue today. I added a missing source map to one of our dependencies and whilst Chrome could locate it, it could not parse it.

The problem was due to the file being saved in a format that Chrome does not read as a .map file.

The simple fix was to save the file using Visual Studio's File > Advanced Save Options.

The file needs to be saved as Unicode (UTF-8 without signature) or US-ASCII.

I found this tip on StackOverflow.