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;" key="login" uuid="BBB3F4DA-8C91-11F1-9BEB-40E5F5CBB814" method="post" uri="">
    <field value="" widget="text" name="username" key="username" id="uuid-BBB42874-8C91-11F1-9BEB-40E5F5CBB814" display="Username" attrs=""/>
    <field name="password" key="password" widget="password" id="uuid-BBB47B08-8C91-11F1-9BEB-40E5F5CBB814" display="Password" attrs=""/>
    <field id="uuid-BBB4C266-8C91-11F1-9BEB-40E5F5CBB814" attrs="" display="Login" name="submit" key="submit" widget="submit" value=""/>
  </form>
</response>