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" uuid="6458A01C-97BB-11F0-86B8-71E954FD9ABD" uri="" encoding="&#x2713;" key="login">
    <field attrs="" name="username" display="Username" key="username" id="uuid-6458D532-97BB-11F0-86B8-71E954FD9ABD" value="" widget="text"/>
    <field attrs="" display="Password" name="password" id="uuid-6459192A-97BB-11F0-86B8-71E954FD9ABD" key="password" widget="password"/>
    <field value="" widget="submit" id="uuid-645961FA-97BB-11F0-86B8-71E954FD9ABD" key="submit" display="Login" name="submit" attrs=""/>
  </form>
</response>