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="" key="login" uuid="127324BC-8008-11F1-A456-F1948F49F76F" method="post" encoding="&#x2713;">
    <field widget="text" value="" attrs="" display="Username" id="uuid-12735798-8008-11F1-A456-F1948F49F76F" key="username" name="username"/>
    <field widget="password" attrs="" id="uuid-12739C4E-8008-11F1-A456-F1948F49F76F" display="Password" key="password" name="password"/>
    <field display="Login" id="uuid-1273E21C-8008-11F1-A456-F1948F49F76F" key="submit" name="submit" widget="submit" attrs="" value=""/>
  </form>
</response>