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" key="login" uri="" encoding="&#x2713;" uuid="37E645B6-39B4-11F1-A546-7775C27BCFD7">
    <field name="username" key="username" attrs="" widget="text" id="uuid-37E67E64-39B4-11F1-A546-7775C27BCFD7" display="Username" value=""/>
    <field widget="password" attrs="" key="password" name="password" id="uuid-37E6C680-39B4-11F1-A546-7775C27BCFD7" display="Password"/>
    <field widget="submit" attrs="" key="submit" name="submit" value="" display="Login" id="uuid-37E71176-39B4-11F1-A546-7775C27BCFD7"/>
  </form>
</response>