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="90C6BC5E-8C04-11F1-AA62-70CAFD48BEF4" key="login" method="post" uri="" encoding="&#x2713;">
    <field widget="text" name="username" key="username" attrs="" value="" id="uuid-90C6F02A-8C04-11F1-AA62-70CAFD48BEF4" display="Username"/>
    <field display="Password" id="uuid-90C738DC-8C04-11F1-AA62-70CAFD48BEF4" key="password" name="password" attrs="" widget="password"/>
    <field value="" id="uuid-90C78486-8C04-11F1-AA62-70CAFD48BEF4" display="Login" widget="submit" name="submit" key="submit" attrs=""/>
  </form>
</response>