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 encoding="&#x2713;" uri="" method="post" uuid="9D2BE89C-233C-11F1-8F23-D0A9A9425785" key="login">
    <field attrs="" name="username" display="Username" key="username" widget="text" id="uuid-9D2C1C36-233C-11F1-8F23-D0A9A9425785" value=""/>
    <field attrs="" name="password" display="Password" key="password" widget="password" id="uuid-9D2C6560-233C-11F1-8F23-D0A9A9425785"/>
    <field widget="submit" key="submit" value="" id="uuid-9D2CAF48-233C-11F1-8F23-D0A9A9425785" display="Login" name="submit" attrs=""/>
  </form>
</response>