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="299EC174-7531-11F0-8E43-FB2BF4489F51" method="post">
    <field value="" name="username" widget="text" attrs="" display="Username" id="uuid-299EF9D2-7531-11F0-8E43-FB2BF4489F51" key="username"/>
    <field name="password" widget="password" attrs="" key="password" id="uuid-299F3C62-7531-11F0-8E43-FB2BF4489F51" display="Password"/>
    <field value="" widget="submit" name="submit" attrs="" display="Login" id="uuid-299F85FA-7531-11F0-8E43-FB2BF4489F51" key="submit"/>
  </form>
</response>