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" uuid="2389396E-48A2-11F1-981B-5C451BBD9EFC" encoding="&#x2713;" key="login">
    <field value="" id="uuid-23896D30-48A2-11F1-981B-5C451BBD9EFC" widget="text" attrs="" key="username" name="username" display="Username"/>
    <field widget="password" id="uuid-2389B240-48A2-11F1-981B-5C451BBD9EFC" attrs="" name="password" display="Password" key="password"/>
    <field name="submit" display="Login" key="submit" value="" widget="submit" id="uuid-2389F9C6-48A2-11F1-981B-5C451BBD9EFC" attrs=""/>
  </form>
</response>