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 uri="" method="post" encoding="&#x2713;" uuid="46F8B806-71CB-11F0-808F-CDC6F3489F51" key="login">
    <field name="username" widget="text" attrs="" value="" key="username" display="Username" id="uuid-46F8EBA0-71CB-11F0-808F-CDC6F3489F51"/>
    <field attrs="" key="password" id="uuid-46F93416-71CB-11F0-808F-CDC6F3489F51" display="Password" name="password" widget="password"/>
    <field id="uuid-46F97C3C-71CB-11F0-808F-CDC6F3489F51" display="Login" key="submit" value="" attrs="" widget="submit" name="submit"/>
  </form>
</response>