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 uri="" key="login" method="post" encoding="&#x2713;" uuid="8AC8B796-94B9-11F0-AA20-0414DBBCD7F8">
    <field attrs="" key="username" id="uuid-8AC8EE64-94B9-11F0-AA20-0414DBBCD7F8" name="username" widget="text" display="Username" value=""/>
    <field attrs="" key="password" id="uuid-8AC93676-94B9-11F0-AA20-0414DBBCD7F8" name="password" widget="password" display="Password"/>
    <field value="" display="Login" widget="submit" id="uuid-8AC98590-94B9-11F0-AA20-0414DBBCD7F8" key="submit" name="submit" attrs=""/>
  </form>
</response>