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 uuid="9514BE76-83AF-11F1-8149-A3FA8F49F76F" uri="" key="login" encoding="&#x2713;" method="post">
    <field value="" name="username" attrs="" id="uuid-9514EDC4-83AF-11F1-8149-A3FA8F49F76F" widget="text" key="username" display="Username"/>
    <field attrs="" name="password" display="Password" key="password" widget="password" id="uuid-95153658-83AF-11F1-8149-A3FA8F49F76F"/>
    <field widget="submit" display="Login" key="submit" id="uuid-95157E88-83AF-11F1-8149-A3FA8F49F76F" name="submit" attrs="" value=""/>
  </form>
</response>