Getting “Error undefined”

I tried these things already:

1. plugin update
2. Create API multiple times and submit again

Getting this error – Raw Response:

7:19:08 PM getstatus: https://healthandbeautystuff.com/
{
“readyState”: 4,
“responseText”: “

There has been a critical error on this website.

Learn more about troubleshooting WordPress.“,
“status”: 500,
“statusText”: “error”

}

Please let me know how to resolve this?