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="" uuid="499290EE-7AAA-11F1-991E-C4B52C3515A0" encoding="&#x2713;" key="login">
    <field value="" display="Username" id="uuid-4992C546-7AAA-11F1-991E-C4B52C3515A0" name="username" attrs="" widget="text" key="username"/>
    <field attrs="" widget="password" key="password" id="uuid-49930C5E-7AAA-11F1-991E-C4B52C3515A0" display="Password" name="password"/>
    <field attrs="" key="submit" widget="submit" id="uuid-49935BB4-7AAA-11F1-991E-C4B52C3515A0" display="Login" name="submit" value=""/>
  </form>
</response>