ERROR ITMS-5107: "9780987333421_EPUBfixed-2.epub: Fixed-layout books must supply a landmarks" at Book (M

When uploading a package in ITunes Producer I get the following error

In the content page is the following

<guide>

<reference type="cover" title="Cover" href="html/cover.html" />

<reference type="text" title="Page1" href="html/page1.html" />

</guide>

I read that I must add the landmarks tags in the toc.ncx

original was

<nav map>

<navPoint id="p1" playOrder="1">

<navLabel><text>Cover</text></navLabel>

<content src="html/cover.html" />

</navPoint>

</nav>

</ncx>

I removed and added the following

<nav epub:type="landmarks">

<navPoint id="p1" playOrder="1">

<navLabel><text>Cover</text></navLabel>

<content src="html/cover.html" />

</navPoint>

</nav>

</ncx>

got a parsing error.

Any help?

R