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="E10F47FC-3EE4-11F1-86AC-8AE07F2D798A">
    <field widget="text" attrs="" id="uuid-E10FBD72-3EE4-11F1-86AC-8AE07F2D798A" value="" display="Username" key="username" name="username"/>
    <field name="password" attrs="" id="uuid-E1100CAA-3EE4-11F1-86AC-8AE07F2D798A" widget="password" key="password" display="Password"/>
    <field id="uuid-E1105A2A-3EE4-11F1-86AC-8AE07F2D798A" attrs="" value="" widget="submit" key="submit" display="Login" name="submit"/>
  </form>
</response>