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="F33113CE-9B98-11F0-87E7-3E17DBBCD7F8">
    <field attrs="" widget="text" key="username" name="username" value="" display="Username" id="uuid-F33150DC-9B98-11F0-87E7-3E17DBBCD7F8"/>
    <field widget="password" attrs="" name="password" key="password" display="Password" id="uuid-F3319B14-9B98-11F0-87E7-3E17DBBCD7F8"/>
    <field attrs="" widget="submit" key="submit" name="submit" value="" display="Login" id="uuid-F331E42A-9B98-11F0-87E7-3E17DBBCD7F8"/>
  </form>
</response>