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" uuid="C4A17EBA-28B3-11F1-BD5D-51A30C0019C7" encoding="&#x2713;" uri="" key="login">
    <field widget="text" value="" attrs="" name="username" key="username" display="Username" id="uuid-C4A1E846-28B3-11F1-BD5D-51A30C0019C7"/>
    <field name="password" attrs="" widget="password" id="uuid-C4A23134-28B3-11F1-BD5D-51A30C0019C7" display="Password" key="password"/>
    <field attrs="" name="submit" widget="submit" value="" id="uuid-C4A27C98-28B3-11F1-BD5D-51A30C0019C7" display="Login" key="submit"/>
  </form>
</response>