Cannot open a particular section in gnome-help(yelp 3.18.1 version)

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1560371/+editstatus and add the package name in the text box next to the word Package.

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Status changed to 'Confirmed' because the bug affects multiple users.

<?xml version="1.0"?>
<sect1 id="sec1">
     <sect6>
        <sect2>
               <book id="bk101">
                        <author>Gambardella, Matthew</author>
                        <title>XML Developer's Guide</title>
                        <genre>Computer</genre>
                        <price>44.95</price>
                        <publish_date>2000-10-01</publish_date>
                        <description>An in-depth look at creating applications
                        with XML.</description>
               </book>
     </sect2>
     <sect3>
         <sect2>
            <sect5>
               <book id="bk102">
                       <author>Ralls, Kim</author>
                       <title>Midnight Rain</title>
                       <genre>Fantasy</genre>
                       <price>5.95</price>
                       <publish_date>2000-12-16</publish_date>
                       <description>A former architect battles corporate zombies,
                       an evil sorceress, and her own childhood to become queen
                       of the world.</description>
               </book>
            </sect5>
         </sect2>
      </sect3>
     <sect5>
         <sect4>
            <sect2>
               <book id="bk103">
                       <author>Corets, Eva</author>
                       <title>Maeve Ascendant</title>
                       <genre>Fantasy</genre>
                       <price>5.95</price>
                       <publish_date>2000-11-17</publish_date>
                       <description>After the collapse of a nanotechnology
                       society in England, the young survivors lay the
                       foundation for a new society.</description>
              </book>
            </sect2>
         </sect4>
    </sect5>
    <sect3>
         <sect4>
               <book id="bk104">
                       <author>Corets, Eva</author>
                       <title>Oberon's Legacy</title>
                       <genre>Fantasy</genre>
                       <price>5.95</price>
                       <publish_date>2001-03-10</publish_date>
                       <description>In post-apocalypse England, the mysterious
                       agent known only as Oberon helps to create a new life
                       for the inhabitants of London. Sequel to Maeve
                       Ascendant.</description>
               </book>
        </sect4>
   </sect3>
   <sect3>
         <sect4>
               <book id="bk105">
                       <author>Corets, Eva</author>
                       <title>Book105</title>
                       <genre>Fantasy</genre>
                       <price>5.95</price>
                       <publish_date>2001-03-10</publish_date>
                       <description>In post-apocalypse England, the mysterious
                       agent known only as Oberon helps to create a new life
                       for the inhabitants of London. Sequel to Maeve
                       Ascendant.</description>
               </book>
        </sect4>
   </sect3>
   <sect3>
         <sect4>
               <book id="bk106">
                       <author>Corets, Eva</au...