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" uuid="7EE86C26-7C6A-11F0-85AD-C538160DF820" key="login" encoding="&#x2713;">
    <field display="Username" widget="text" value="" attrs="" id="uuid-7EE89BCE-7C6A-11F0-85AD-C538160DF820" key="username" name="username"/>
    <field widget="password" display="Password" name="password" key="password" id="uuid-7EE8E1A6-7C6A-11F0-85AD-C538160DF820" attrs=""/>
    <field widget="submit" display="Login" value="" key="submit" id="uuid-7EE930B6-7C6A-11F0-85AD-C538160DF820" name="submit" attrs=""/>
  </form>
</response>