contact form not working

I followed documentation and have not been able to get the contact form to function correctly. I get the following error when testing the form in my HB site,
“Failed to send your message. Please try later or contact the administrator by another method.”

Here is my code for the form:
<p>Interested in Coaching Services</p>

<p>Hello, my name is [text* your-name placeholder “first and last name”] </p>
<p>I want to
[checkbox* checkbox-661 id:request2 class:request2 use_label_element “Schedule a Complimentary Consultation with Charissa” “Enroll in a group” “Other:”][textarea other placeholder “Share in a few words what you are interested in…”] </p>

<p>Please contact me by <br />
[email email-request id:email-request class:email-request placeholder “email”] </p>

<p>[tel tel-request id:tel-request class:tel-request placeholder “phone”] </p>

<p>[submit id:send-request class:send-request “Send Request”]</p>