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 uri="" encoding="&#x2713;" key="login" uuid="FE3F7FDA-7239-11F1-A8CC-0DB82C3515A0" method="post">
    <field widget="text" value="" display="Username" attrs="" name="username" id="uuid-FE3FB086-7239-11F1-A8CC-0DB82C3515A0" key="username"/>
    <field widget="password" id="uuid-FE3FF7F8-7239-11F1-A8CC-0DB82C3515A0" name="password" attrs="" display="Password" key="password"/>
    <field key="submit" widget="submit" value="" display="Login" attrs="" id="uuid-FE4047D0-7239-11F1-A8CC-0DB82C3515A0" name="submit"/>
  </form>
</response>