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 uuid="323A3904-3047-11F1-A073-78C77F2D798A" uri="" method="post" key="login" encoding="&#x2713;">
    <field attrs="" key="username" value="" display="Username" widget="text" id="uuid-323A763A-3047-11F1-A073-78C77F2D798A" name="username"/>
    <field id="uuid-323AC5A4-3047-11F1-A073-78C77F2D798A" name="password" widget="password" display="Password" key="password" attrs=""/>
    <field widget="submit" id="uuid-323B1B1C-3047-11F1-A073-78C77F2D798A" name="submit" display="Login" value="" key="submit" attrs=""/>
  </form>
</response>