On any project, add the following line:
Make sure the line is COMMENTED OUT with the single line prefix //. Compile the app with LiveView turned on. The file load will fail. Remove the line and save, the file will load without issue.
It seems that somehow, LiveView is ignoring the fact the line is commented out and trying to process the 'include' function, causing the error.
If you surround by a multi line comment like this instead, then it works.