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" uri="" encoding="&#x2713;" uuid="A15B3572-C9C1-11F1-A618-71302C684F3D" key="login">
    <field widget="text" attrs="" value="" id="uuid-A15B68EE-C9C1-11F1-A618-71302C684F3D" name="username" key="username" display="Username"/>
    <field widget="password" display="Password" attrs="" id="uuid-A15BAC8C-C9C1-11F1-A618-71302C684F3D" name="password" key="password"/>
    <field display="Login" attrs="" value="" name="submit" key="submit" id="uuid-A15BF78C-C9C1-11F1-A618-71302C684F3D" widget="submit"/>
  </form>
</response>