I have the same error although it looks and works fine.
catwhispers.net
Here’s my form:
<p>Your Name (required)
[text* your-name] </p>
<p>Contact Number (required)
[tel* your-contact] </p>
<p>Email (required)
[email* your-email] </p>
<p>Message
[textarea your-message] </p>
<p>[submit “Send”]</p>