Contact Form 7: Error when submiting

I can’t get my contact form on my homepage to submit successfully.

Does anyone know why that is happening?

here is my website: naplesgastro.com

This is the code I am using for the contact form:

<div class=”wpcf7-form-left”>
[text* your-name placeholder “Your Name *”]
[email* your-email placeholder “Your E-mail *”]
[text your-subject placeholder "Your Subject"]
[text phone-number placeholder "Phone Number"]
</div>
<div class=”wpcf7-form-right”>
[textarea your-message placeholder “Your Message”]
</div>
<div class=”wpcf7-form-submit”>
[submit “Send”]
</div>