Console Errors when using this plugin on a wordpress site

[r-interactive]

Hello,

It seems to be a great light-weight plugin that we would like to use, but when I follow the steps on getting it to work, it's giving me a lot of errors.
Please find the error messages below and a screenshot attached.
==============ERRORS=============
Access to XMLHttpRequest at 'https://www.nameshouts.com/api/names/naureenanwar' from origin 'https://XXXXX' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.

Uncaught SyntaxError: Unexpected token u in JSON at position 0
at JSON.parse ()
at vocalizer.min.js?ver=20151215:1:681
at a.onerror (vocalizer.min.js?ver=20151215:1:467)

Failed to load resource: net::ERR_FAILED www.nameshouts.com/api/names/naureenanwar:1

==============ERRORS=============

When I tried using this method:
Naureen Anwar
or just this simple name
John

this gives me the errors mentioned above. But when I tried this method (custom mp3 audio):

John

This works and plays the audio. This doesn't give me any errors.

How can I fix this?

Thank you!

[r-interactive]

Just to add, I am using this js file https://github.com/atifazam/vocalizer/blob/master/dist/vocalizer.js