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" method="post" encoding="&#x2713;" uuid="C20CA2C2-29C8-11F1-A3B9-94EA7F2D798A" uri="">
    <field key="username" id="uuid-C20CDBE8-29C8-11F1-A3B9-94EA7F2D798A" display="Username" name="username" widget="text" attrs="" value=""/>
    <field widget="password" name="password" display="Password" id="uuid-C20D29F4-29C8-11F1-A3B9-94EA7F2D798A" key="password" attrs=""/>
    <field display="Login" id="uuid-C20D7A62-29C8-11F1-A3B9-94EA7F2D798A" key="submit" widget="submit" name="submit" attrs="" value=""/>
  </form>
</response>