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 uuid="F073A384-87CB-11F1-ACB5-C088898B97BA" uri="" method="post" key="login" encoding="&#x2713;">
    <field value="" display="Username" name="username" attrs="" widget="text" key="username" id="uuid-F073D566-87CB-11F1-ACB5-C088898B97BA"/>
    <field widget="password" key="password" id="uuid-F0741FD0-87CB-11F1-ACB5-C088898B97BA" attrs="" display="Password" name="password"/>
    <field name="submit" display="Login" value="" attrs="" id="uuid-F0746B3E-87CB-11F1-ACB5-C088898B97BA" widget="submit" key="submit"/>
  </form>
</response>