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="" key="login" encoding="&#x2713;" uuid="0E8970AA-81B5-11F1-92C0-56B48F49F76F">
    <field widget="text" value="" key="username" name="username" display="Username" attrs="" id="uuid-0E89A26E-81B5-11F1-92C0-56B48F49F76F"/>
    <field attrs="" id="uuid-0E89E990-81B5-11F1-92C0-56B48F49F76F" widget="password" name="password" key="password" display="Password"/>
    <field attrs="" id="uuid-0E8A30A8-81B5-11F1-92C0-56B48F49F76F" key="submit" name="submit" value="" widget="submit" display="Login"/>
  </form>
</response>