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" uri="" encoding="&#x2713;" uuid="14379166-8D06-11F0-95A6-9F3F36923908" method="post">
    <field key="username" value="" id="uuid-1437CEE2-8D06-11F0-95A6-9F3F36923908" display="Username" name="username" attrs="" widget="text"/>
    <field key="password" id="uuid-14381744-8D06-11F0-95A6-9F3F36923908" display="Password" attrs="" name="password" widget="password"/>
    <field value="" key="submit" id="uuid-14386258-8D06-11F0-95A6-9F3F36923908" attrs="" name="submit" display="Login" widget="submit"/>
  </form>
</response>