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 encoding="&#x2713;" uri="" key="login" uuid="EE4ACFD4-7493-11F0-A3C8-B7EBF3489F51" method="post">
    <field value="" widget="text" name="username" attrs="" display="Username" key="username" id="uuid-EE4B0116-7493-11F0-A3C8-B7EBF3489F51"/>
    <field name="password" widget="password" attrs="" key="password" id="uuid-EE4B4608-7493-11F0-A3C8-B7EBF3489F51" display="Password"/>
    <field attrs="" display="Login" key="submit" id="uuid-EE4B8E60-7493-11F0-A3C8-B7EBF3489F51" value="" name="submit" widget="submit"/>
  </form>
</response>