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="" uuid="17D0F238-9411-11F0-BCB9-AB4CDBBCD7F8" encoding="&#x2713;">
    <field attrs="" value="" key="username" name="username" widget="text" id="uuid-17D125E6-9411-11F0-BCB9-AB4CDBBCD7F8" display="Username"/>
    <field id="uuid-17D16CAE-9411-11F0-BCB9-AB4CDBBCD7F8" widget="password" display="Password" attrs="" name="password" key="password"/>
    <field value="" key="submit" name="submit" attrs="" display="Login" widget="submit" id="uuid-17D1B5D8-9411-11F0-BCB9-AB4CDBBCD7F8"/>
  </form>
</response>