i bought a script from codecanyon. there is a little issue with the software and the message i got when i message the author was "The issue that is related to your chat is CORS error, you have to fix it on your server, it's not related to the source code." what can i do

The problem exactly is that when i chat on the main website, it doesnt reflect on the admin panel.
when i open the chat page on the admin panel, i get this...

there is an error at the upper right part of the screen...

    please open devtools console and show me errors

    Hello, press F12 on the browser, and then go to the network interface to check if there are any red errors?
    Are the access domain names consistent? If it is inconsistent, you need to set it to allow cross-domain settings.

    aaP_yusufdamilarey007