Json file reimported has error

I exported a simple example surface script and wanted to import it as an exercise to check on integrity. When I try to reimport the file, it has an error coming up saying ‘Not a json file’.
I checked and it doesn’t seem to have any errors that I can see but before moving on, could someone check and see if it simply will import without error?

If I create a simple script and hook it up, there are not publish errors.
If I export eg Akaimix, I don’t get the errors back on import?

Cheers