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" method="post" encoding="&#x2713;" uuid="C5ABF944-940B-11F0-9522-CA923B611A6C" uri="">
    <field id="uuid-C5AC2982-940B-11F0-9522-CA923B611A6C" value="" attrs="" name="username" key="username" display="Username" widget="text"/>
    <field attrs="" id="uuid-C5AC7068-940B-11F0-9522-CA923B611A6C" key="password" display="Password" widget="password" name="password"/>
    <field key="submit" display="Login" widget="submit" name="submit" attrs="" id="uuid-C5ACB9EC-940B-11F0-9522-CA923B611A6C" value=""/>
  </form>
</response>