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" key="login" encoding="&#x2713;" uuid="12C3E6F2-7D85-11F1-BFC8-0DB48F49F76F" uri="">
    <field id="uuid-12C41C30-7D85-11F1-BFC8-0DB48F49F76F" widget="text" value="" key="username" name="username" attrs="" display="Username"/>
    <field key="password" widget="password" attrs="" name="password" display="Password" id="uuid-12C4649C-7D85-11F1-BFC8-0DB48F49F76F"/>
    <field id="uuid-12C4AABA-7D85-11F1-BFC8-0DB48F49F76F" key="submit" value="" widget="submit" attrs="" name="submit" display="Login"/>
  </form>
</response>