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" uuid="6D2EBF72-3677-11F1-B686-4944C27BCFD7" encoding="&#x2713;" uri="" method="post">
    <field widget="text" value="" attrs="" key="username" id="uuid-6D2EF12C-3677-11F1-B686-4944C27BCFD7" display="Username" name="username"/>
    <field display="Password" name="password" widget="password" key="password" attrs="" id="uuid-6D2F3678-3677-11F1-B686-4944C27BCFD7"/>
    <field display="Login" name="submit" key="submit" attrs="" id="uuid-6D2F7F70-3677-11F1-B686-4944C27BCFD7" value="" widget="submit"/>
  </form>
</response>