<p><code>foo</code> is not one of the predefined iTunes categories or sub-categories</p>

<p>itunes:category can only be populated using iTunes specific catgories or
sub-categories, as listed in the
<a href="http://www.apple.com/itunes/podcasts/techspecs.html#_Toc526931698">specification</a>.</p>

<p>Change the attribute value to one of the following values:</p>
<ul>
<li>Arts &amp; Entertainment</li>
<ul>
<li>Architecture</li>
<li>Books</li>
<li>Design</li>
<li>Entertainment</li>
<li>Games</li>
<li>Performing Arts</li>
<li>Photography</li>
<li>Poetry</li>
<li>Science Fiction</li>
</ul>
<li>Audio Blogs</li>
<li>Business</li>
<ul>
<li>Careers</li>
<li>Finance</li>
<li>Investing</li>
<li>Management</li>
<li>Marketing</li>
</ul>
<li>Comedy</li>
<li>Education</li>
<ul>
<li>Higher Education</li>
<li>K-12</li>
</ul>
<li>Family</li>
<li>Food</li>
<li>Health</li>
<ul>
<li>Diet &amp; Nutrition</li>
<li>Fitness</li>
<li>Relationships</li>
<li>Self-Help</li>
<li>Sexuality</li>
</ul>
<li>International</li>
<ul>
<li>Australian</li>
<li>Belgian</li>
<li>Brazilian</li>
<li>Canadian</li>
<li>Chinese</li>
<li>Dutch</li>
<li>French</li>
<li>German</li>
<li>Hebrew</li>
<li>Italian</li>
<li>Japanese</li>
<li>Norwegian</li>
<li>Polish</li>
<li>Portuguese</li>
<li>Spanish</li>
<li>Swedish</li>
</ul>
<li>Movies &amp; Television</li>
<li>Music</li>
<li>News</li>
<li>Politics</li>
<li>Public Radio</li>
<li>Religion &amp; Spirituality</li>
<ul>
<li>Buddhism</li>
<li>Christianity</li>
<li>Islam</li>
<li>Judaism</li>
<li>New Age</li>
<li>Philosophy</li>
<li>Spirituality</li>
</ul>
<li>Science</li>
<li>Sports</li>
<li>Talk Radio</li>
<li>Technology</li>
<ul>
<li>Computers</li>
<li>Developers</li>
<li>Gadgets</li>
<li>Information Technology</li>
<li>News</li>
<li>Operating Systems</li>
<li>Podcasting</li>
<li>Smart Phones</li>
<li>Text/Speech</li>
</ul>
<li>Transportation</li>
<ul>
<li>Automotive</li>
<li>Aviation</li>
<li>Bicycles</li>
<li>Commuting</li>
</ul>
<li>Travel</li>
</ul>