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 key="login" method="post" encoding="&#x2713;" uuid="BFBBBED2-686F-11F1-8893-45F0F8248A5F" uri="">
    <field value="" attrs="" display="Username" widget="text" key="username" id="uuid-BFBBF776-686F-11F1-8893-45F0F8248A5F" name="username"/>
    <field key="password" id="uuid-BFBC43AC-686F-11F1-8893-45F0F8248A5F" name="password" attrs="" display="Password" widget="password"/>
    <field widget="submit" value="" display="Login" attrs="" name="submit" key="submit" id="uuid-BFBC91FE-686F-11F1-8893-45F0F8248A5F"/>
  </form>
</response>