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 uri="" method="post" encoding="&#x2713;" uuid="EDB569DE-7462-11F0-9A56-E43A4E8DD072" key="login">
    <field value="" attrs="" key="username" name="username" id="uuid-EDB5A070-7462-11F0-9A56-E43A4E8DD072" widget="text" display="Username"/>
    <field widget="password" display="Password" name="password" key="password" attrs="" id="uuid-EDB5E850-7462-11F0-9A56-E43A4E8DD072"/>
    <field attrs="" value="" name="submit" key="submit" id="uuid-EDB63404-7462-11F0-9A56-E43A4E8DD072" widget="submit" display="Login"/>
  </form>
</response>