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 encoding="&#x2713;" key="login" uuid="71799A30-9342-11F0-AC5A-75CB54FD9ABD" method="post" uri="">
    <field widget="text" name="username" display="Username" value="" attrs="" key="username" id="uuid-7179CCDA-9342-11F0-AC5A-75CB54FD9ABD"/>
    <field widget="password" name="password" display="Password" attrs="" id="uuid-717A0FBA-9342-11F0-AC5A-75CB54FD9ABD" key="password"/>
    <field value="" attrs="" key="submit" id="uuid-717A57EA-9342-11F0-AC5A-75CB54FD9ABD" widget="submit" name="submit" display="Login"/>
  </form>
</response>