Trigger schedule event triggers CORS error

I am using the example provided at

Whenever I manually trigger the event using - Trigger schedule event - under schedule tab, it gives me a CORS error:

Access to fetch at '' from origin '' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

This was working few days ago and it suddenly stopped. Not sure what the problem is. Help!

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