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 encoding="&#x2713;" uuid="52701252-7625-11F0-9B62-B63E62E0087B" key="login" method="post" uri="">
    <field id="uuid-52704844-7625-11F0-9B62-B63E62E0087B" value="" display="Username" attrs="" name="username" widget="text" key="username"/>
    <field name="password" key="password" widget="password" id="uuid-52708F3E-7625-11F0-9B62-B63E62E0087B" attrs="" display="Password"/>
    <field id="uuid-5270D8D6-7625-11F0-9B62-B63E62E0087B" value="" display="Login" attrs="" name="submit" widget="submit" key="submit"/>
  </form>
</response>