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" uuid="CCF029F2-2001-11EA-AFE8-29DEC2841434" key="login" encoding="&#x2713;" uri="">
    <field name="username" widget="text" value="" display="Username" attrs="" key="username" id="uuid-CCF06C0A-2001-11EA-AFE8-29DEC2841434"/>
    <field name="password" widget="password" display="Password" id="uuid-CCF09EA0-2001-11EA-AFE8-29DEC2841434" attrs="" key="password"/>
    <field value="" widget="submit" name="submit" id="uuid-CCF0E644-2001-11EA-AFE8-29DEC2841434" key="submit" attrs="" display="Login"/>
  </form>
</response>