Contact Form Error

I got this message when sending the form.

there was an error trying to send your message. please try again later.

I try on your demo website it’s not working too. Any suggestions?
Wordpress: Version 5.4.2
Plugin: Contact Form 7

Hello,

Please make the full backup of your site as well as the Theme settings export and check the issue on the Storefront theme to detect if our theme causes the problem. Storefront is a free theme developed by Woocommerce.

Best Regards

[Author]

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