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 method="post" uri="" key="login" encoding="&#x2713;" uuid="7B126D2E-4765-11F1-AC0A-ABDD2C3515A0">
    <field attrs="" value="" widget="text" display="Username" name="username" id="uuid-7B12A19A-4765-11F1-AC0A-ABDD2C3515A0" key="username"/>
    <field name="password" key="password" id="uuid-7B12E86C-4765-11F1-AC0A-ABDD2C3515A0" attrs="" display="Password" widget="password"/>
    <field value="" display="Login" widget="submit" attrs="" key="submit" id="uuid-7B1331B4-4765-11F1-AC0A-ABDD2C3515A0" name="submit"/>
  </form>
</response>