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" uri="" encoding="&#x2713;" key="login" uuid="7556A5FE-D01C-11F1-8AA0-57F38D6E13F8">
    <field attrs="" widget="text" id="uuid-7556D7F4-D01C-11F1-8AA0-57F38D6E13F8" display="Username" value="" key="username" name="username" extra=""/>
    <field widget="password" attrs="" key="password" display="Password" id="uuid-75571F70-D01C-11F1-8AA0-57F38D6E13F8" extra="" name="password"/>
    <field value="" key="submit" extra="" name="submit" widget="submit" attrs="" id="uuid-75576980-D01C-11F1-8AA0-57F38D6E13F8" display="Login"/>
  </form>
</response>