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 method="post" key="login" uri="" encoding="&#x2713;" uuid="F77A212C-84B9-11F1-A622-59917BD1CDC2">
    <field name="username" key="username" value="" id="uuid-F77A57D2-84B9-11F1-A622-59917BD1CDC2" attrs="" widget="text" display="Username"/>
    <field key="password" name="password" display="Password" widget="password" attrs="" id="uuid-F77AA5AC-84B9-11F1-A622-59917BD1CDC2"/>
    <field key="submit" name="submit" value="" attrs="" id="uuid-F77AF548-84B9-11F1-A622-59917BD1CDC2" display="Login" widget="submit"/>
  </form>
</response>