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="" method="post" encoding="&#x2713;" key="login" uuid="22EED8B6-71FB-11F0-8C52-D0F3F3489F51">
    <field value="" key="username" attrs="" display="Username" id="uuid-22EF0EBC-71FB-11F0-8C52-D0F3F3489F51" widget="text" name="username"/>
    <field id="uuid-22EF5142-71FB-11F0-8C52-D0F3F3489F51" display="Password" attrs="" key="password" name="password" widget="password"/>
    <field value="" key="submit" attrs="" display="Login" id="uuid-22EF9CEC-71FB-11F0-8C52-D0F3F3489F51" widget="submit" name="submit"/>
  </form>
</response>