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="23105C36-3AD5-11F1-B686-98931ABF1312" method="post" encoding="&#x2713;" uri="" key="login">
    <field name="username" display="Username" value="" key="username" attrs="" widget="text" id="uuid-23108F76-3AD5-11F1-B686-98931ABF1312"/>
    <field name="password" display="Password" id="uuid-2310D404-3AD5-11F1-B686-98931ABF1312" widget="password" key="password" attrs=""/>
    <field name="submit" display="Login" value="" key="submit" attrs="" widget="submit" id="uuid-23111414-3AD5-11F1-B686-98931ABF1312"/>
  </form>
</response>