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 uuid="EC62C9E6-93AB-11F1-8F18-50377BD1CDC2" key="login" method="post" uri="" encoding="&#x2713;">
    <field key="username" name="username" widget="text" attrs="" value="" id="uuid-EC62FBF0-93AB-11F1-8F18-50377BD1CDC2" display="Username"/>
    <field attrs="" widget="password" name="password" key="password" display="Password" id="uuid-EC634510-93AB-11F1-8F18-50377BD1CDC2"/>
    <field id="uuid-EC638DEA-93AB-11F1-8F18-50377BD1CDC2" display="Login" key="submit" name="submit" attrs="" widget="submit" value=""/>
  </form>
</response>