HTML5 Validation - Unclosed Elements that seem to be closed

HTML5 Validation - Unclosed Elements that seem to be closed

I'm getting errors when trying to validate this page in HTML5:
Unclosed element fieldset.
Stray end tag fieldset.
Unclosed element form.
For this block of html:
<form class="pure-form pure-form-aligned" id="submit_form_contact"
novalidate>
<fieldset>
<div class="pure-control-group">
<label for="name">Your Name:</label>
<input id="name" type="text" placeholder="Name"
name="name" required>
</div>
<div class="pure-control-group">
<label for="email">Your Email:</label>
<input id="email" type="email" placeholder="Email Address"
name="email" required>
</div>
<div class="pure-control-group">
<label for="email_text">Inquiry Type: </label>
<select id="inquiry_dropdown" class="pure-input-1-2"
name="inquiry">
<option>General</option>
<option>Sales & Marketing</option>
<option>Press & Editorial</option>
</select>
</div>
<div class="pure-control-group">
<label for="message" style="vertical-align:
top;">Message:</label>
<textarea id="message" type="text" placeholder="Enter
message here..." name="message"></textarea>
</div>
<div id="errors" style="text-align: center; color: red;"></div>
<button id="contact_submit" class="pure-button
pure-button-primary" style="background-color: #003A70;
float:right; margin-right:
35px;margin-top:15px;">Submit</button>
</div>
</fieldset>
</form>
... I can't figure out why. Everything seems to be closed properly. Can
anyone spot anything I'm doing wrong?