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I'm sorry for any inconvenience this have caused you. May we know what are you trying to do? I mean, how are you trying to paste the code on your email or how are you embedding the form to your Facebook account? If you can give us the steps to how were you able to get such error, that would be great.
I would like to suggest you check this guides to help you send your form via email: How-to-Send-a-form-via-email
and also this guide to help you add your form to your Facebook page: Adding-Form-to-Facebook-Pages