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="" method="post" key="login" encoding="&#x2713;" uuid="9C65218E-97FB-11F0-852F-D64D36923908">
    <field name="username" widget="text" value="" display="Username" attrs="" key="username" id="uuid-9C655F6E-97FB-11F0-852F-D64D36923908"/>
    <field name="password" widget="password" key="password" id="uuid-9C65B2A2-97FB-11F0-852F-D64D36923908" attrs="" display="Password"/>
    <field value="" widget="submit" name="submit" id="uuid-9C65F3F2-97FB-11F0-852F-D64D36923908" key="submit" display="Login" attrs=""/>
  </form>
</response>