'Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('<URL>') does

ERROR: Failed to execute 'postMessage' on 'DOMWindow': The target origin provided ('') does not match the recipient window's origin ('').

Hi, can anyone help me with this error?

I'm trying to insert an iframe containing a chatbot. enter image description here

Ho utilizzato questo:

Thank you all!

html iframe postmessage

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