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 encoding="&#x2713;" key="login" uuid="10CA176E-729F-11F0-BB45-4BECB03FE236" method="post" uri="">
    <field value="" key="username" name="username" display="Username" widget="text" id="uuid-10CA4B4E-729F-11F0-BB45-4BECB03FE236" attrs=""/>
    <field id="uuid-10CA9374-729F-11F0-BB45-4BECB03FE236" display="Password" widget="password" attrs="" key="password" name="password"/>
    <field name="submit" key="submit" value="" attrs="" display="Login" widget="submit" id="uuid-10CADF82-729F-11F0-BB45-4BECB03FE236"/>
  </form>
</response>