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 uuid="29183866-4F88-11F1-A7A3-44DBF8248A5F" uri="" encoding="&#x2713;" key="login" method="post">
    <field widget="text" name="username" display="Username" attrs="" value="" key="username" id="uuid-2918673C-4F88-11F1-A7A3-44DBF8248A5F"/>
    <field name="password" display="Password" widget="password" key="password" id="uuid-2918AFB2-4F88-11F1-A7A3-44DBF8248A5F" attrs=""/>
    <field value="" attrs="" id="uuid-2918F724-4F88-11F1-A7A3-44DBF8248A5F" key="submit" widget="submit" display="Login" name="submit"/>
  </form>
</response>