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;" uri="" uuid="CCFA8BFA-9BD8-11F0-A699-947D3B611A6C">
    <field value="" name="username" attrs="" id="uuid-CCFAC002-9BD8-11F0-A699-947D3B611A6C" display="Username" key="username" widget="text"/>
    <field attrs="" name="password" id="uuid-CCFB08E6-9BD8-11F0-A699-947D3B611A6C" display="Password" key="password" widget="password"/>
    <field attrs="" name="submit" value="" widget="submit" key="submit" display="Login" id="uuid-CCFB53C8-9BD8-11F0-A699-947D3B611A6C"/>
  </form>
</response>