File not found

I’ve created a contact form, but when I click submit I receive the message
File not found
This is my code, someone kknow what’s the problem? Thanks

<div style=”background-color: papayawhip; padding: 10px; border: 5px solid gold;” >

<p>
<label>Il tuo nome</label>
<input type=”text” name=”NAME” placeholder=”” style=”width:400px” required />
</p>
<p>
<label>La tua eMail</label>
<input type=”email” name=”EMAIL” placeholder=”” style=”width:500px” required />
</p>
<p>
<label>Oggetto</label>
<input type=”text” name=”SUBJECT” placeholder=”” style=”width:500px” required />
</p>
<p>
<label>Messaggio</label>
<textarea name=”MESSAGE” placeholder=”” style=”width:500px” required></textarea>
</p>
<p>
<input type=”Submit” value=”Invio” />
</p>
</div>