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 method="post" uri="" key="login" encoding="&#x2713;" uuid="FA51A816-1862-11F1-AA35-3EB92597109C">
    <field value="" display="Username" key="username" attrs="" widget="text" id="uuid-FA51D980-1862-11F1-AA35-3EB92597109C" name="username"/>
    <field widget="password" id="uuid-FA522160-1862-11F1-AA35-3EB92597109C" name="password" attrs="" display="Password" key="password"/>
    <field id="uuid-FA526B70-1862-11F1-AA35-3EB92597109C" name="submit" widget="submit" attrs="" key="submit" display="Login" value=""/>
  </form>
</response>