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="2F817850-467F-11F1-B33E-DA61242F1D8B" uri="" key="login" method="post">
    <field value="" attrs="" display="Username" widget="text" key="username" id="uuid-2F81A94C-467F-11F1-B33E-DA61242F1D8B" name="username"/>
    <field widget="password" name="password" id="uuid-2F81F15E-467F-11F1-B33E-DA61242F1D8B" key="password" attrs="" display="Password"/>
    <field attrs="" display="Login" value="" key="submit" name="submit" id="uuid-2F823D6C-467F-11F1-B33E-DA61242F1D8B" widget="submit"/>
  </form>
</response>