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" uri="" encoding="&#x2713;" uuid="5FDD9F9E-31BA-11F1-8470-1080C27BCFD7">
    <field value="" key="username" attrs="" display="Username" id="uuid-5FDDD48C-31BA-11F1-8470-1080C27BCFD7" widget="text" name="username"/>
    <field attrs="" key="password" id="uuid-5FDE1C30-31BA-11F1-8470-1080C27BCFD7" display="Password" name="password" widget="password"/>
    <field id="uuid-5FDE67E4-31BA-11F1-8470-1080C27BCFD7" display="Login" name="submit" widget="submit" value="" attrs="" key="submit"/>
  </form>
</response>