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;" uuid="88DE2272-46F7-11F1-AEC8-CF18242F1D8B" uri="" key="login" method="post">
    <field value="" attrs="" display="Username" widget="text" id="uuid-88DE542C-46F7-11F1-AEC8-CF18242F1D8B" name="username" key="username"/>
    <field widget="password" name="password" key="password" id="uuid-88DE9BBC-46F7-11F1-AEC8-CF18242F1D8B" display="Password" attrs=""/>
    <field value="" display="Login" attrs="" widget="submit" name="submit" id="uuid-88DEE3E2-46F7-11F1-AEC8-CF18242F1D8B" key="submit"/>
  </form>
</response>