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 key="login" uri="" method="post" uuid="71691354-3B53-11F1-B2AA-5E8E0C0019C7" encoding="&#x2713;">
    <field value="" name="username" widget="text" key="username" attrs="" display="Username" id="uuid-716943BA-3B53-11F1-B2AA-5E8E0C0019C7"/>
    <field key="password" widget="password" name="password" id="uuid-71698B18-3B53-11F1-B2AA-5E8E0C0019C7" attrs="" display="Password"/>
    <field attrs="" display="Login" id="uuid-7169D65E-3B53-11F1-B2AA-5E8E0C0019C7" name="submit" value="" key="submit" widget="submit"/>
  </form>
</response>