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;" uuid="3ECB7E2E-8D6E-11F1-B1B4-8FB6F5CBB814" key="login" method="post" uri="">
    <field widget="text" value="" name="username" key="username" id="uuid-3ECBB308-8D6E-11F1-B1B4-8FB6F5CBB814" attrs="" display="Username"/>
    <field display="Password" attrs="" id="uuid-3ECBFE62-8D6E-11F1-B1B4-8FB6F5CBB814" widget="password" key="password" name="password"/>
    <field attrs="" display="Login" id="uuid-3ECC475A-8D6E-11F1-B1B4-8FB6F5CBB814" key="submit" name="submit" value="" widget="submit"/>
  </form>
</response>