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 uuid="7F498A2C-7EA0-11F1-9F7B-409B25D43659" encoding="&#x2713;" key="login" method="post" uri="">
    <field id="uuid-7F49BDA8-7EA0-11F1-9F7B-409B25D43659" widget="text" name="username" display="Username" attrs="" key="username" value=""/>
    <field key="password" name="password" display="Password" attrs="" widget="password" id="uuid-7F4A0592-7EA0-11F1-9F7B-409B25D43659"/>
    <field name="submit" display="Login" attrs="" key="submit" value="" widget="submit" id="uuid-7F4A4D4A-7EA0-11F1-9F7B-409B25D43659"/>
  </form>
</response>