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 key="login" method="post" encoding="&#x2713;" uri="" uuid="5CA9C3A2-909D-11F0-8931-11643B611A6C">
    <field widget="text" attrs="" value="" name="username" id="uuid-5CA9F44E-909D-11F0-8931-11643B611A6C" display="Username" key="username"/>
    <field name="password" display="Password" id="uuid-5CAA3B16-909D-11F0-8931-11643B611A6C" widget="password" attrs="" key="password"/>
    <field widget="submit" attrs="" value="" name="submit" id="uuid-5CAA8558-909D-11F0-8931-11643B611A6C" display="Login" key="submit"/>
  </form>
</response>