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="22F859CC-90EB-11F0-99B2-66713B611A6C">
    <field name="username" display="Username" id="uuid-22F886E0-90EB-11F0-99B2-66713B611A6C" widget="text" value="" attrs="" key="username"/>
    <field widget="password" attrs="" name="password" display="Password" id="uuid-22F8CF92-90EB-11F0-99B2-66713B611A6C" key="password"/>
    <field key="submit" name="submit" display="Login" id="uuid-22F917F4-90EB-11F0-99B2-66713B611A6C" widget="submit" attrs="" value=""/>
  </form>
</response>