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 method="post" uuid="4DEE8314-F387-11F0-BE47-D432802D798A" uri="" key="login" encoding="&#x2713;">
    <field widget="text" key="username" attrs="" id="uuid-4DEEB6AE-F387-11F0-BE47-D432802D798A" value="" display="Username" name="username"/>
    <field widget="password" key="password" attrs="" id="uuid-4DEEFFA6-F387-11F0-BE47-D432802D798A" name="password" display="Password"/>
    <field attrs="" widget="submit" key="submit" display="Login" name="submit" id="uuid-4DEF46E6-F387-11F0-BE47-D432802D798A" value=""/>
  </form>
</response>