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;" method="post" uuid="6DACCF9C-90DC-11F1-9AB4-C73F7BD1CDC2" key="login">
    <field name="username" value="" widget="text" attrs="" key="username" id="uuid-6DAD04E4-90DC-11F1-9AB4-C73F7BD1CDC2" display="Username"/>
    <field id="uuid-6DAD4AB2-90DC-11F1-9AB4-C73F7BD1CDC2" display="Password" name="password" widget="password" attrs="" key="password"/>
    <field attrs="" widget="submit" value="" name="submit" key="submit" display="Login" id="uuid-6DAD9440-90DC-11F1-9AB4-C73F7BD1CDC2"/>
  </form>
</response>