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 key="login" uri="" encoding="&#x2713;" method="post" uuid="44C4FDFE-3A77-11F1-B260-FF821ABF1312">
    <field value="" widget="text" id="uuid-44C52F22-3A77-11F1-B260-FF821ABF1312" attrs="" key="username" name="username" display="Username"/>
    <field widget="password" id="uuid-44C57694-3A77-11F1-B260-FF821ABF1312" key="password" attrs="" display="Password" name="password"/>
    <field widget="submit" id="uuid-44C5C022-3A77-11F1-B260-FF821ABF1312" attrs="" key="submit" value="" display="Login" name="submit"/>
  </form>
</response>