XSLT Error

Empty filename at /home/ubuntu/perl5/perlbrew/perls/perl-5.18.0/lib/site_perl/5.18.0/Chameleon5/Template/XSLT.pm line 575.

Response XML

<?xml version="1.0"?>
<response>
  <form key="login" uri="" encoding="&#x2713;" uuid="6D35EB84-3AA6-11F1-AA95-45CB0C0019C7" method="post">
    <field key="username" widget="text" name="username" value="" id="uuid-6D3621A8-3AA6-11F1-AA95-45CB0C0019C7" attrs="" display="Username"/>
    <field id="uuid-6D3667C6-3AA6-11F1-AA95-45CB0C0019C7" display="Password" attrs="" widget="password" key="password" name="password"/>
    <field key="submit" widget="submit" name="submit" value="" id="uuid-6D36B302-3AA6-11F1-AA95-45CB0C0019C7" attrs="" display="Login"/>
  </form>
</response>