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="6159CF0C-4469-11F1-83A9-F79925D43659">
    <field name="username" id="uuid-615A045E-4469-11F1-83A9-F79925D43659" key="username" widget="text" attrs="" value="" display="Username"/>
    <field display="Password" attrs="" id="uuid-615A47C0-4469-11F1-83A9-F79925D43659" name="password" key="password" widget="password"/>
    <field key="submit" name="submit" id="uuid-615A8E7E-4469-11F1-83A9-F79925D43659" widget="submit" display="Login" value="" attrs=""/>
  </form>
</response>