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" method="post" encoding="&#x2713;" uuid="65551FD4-683C-11F1-BA35-A5E4F8248A5F" uri="">
    <field widget="text" value="" display="Username" attrs="" name="username" key="username" id="uuid-65554F5E-683C-11F1-BA35-A5E4F8248A5F"/>
    <field key="password" id="uuid-65559932-683C-11F1-BA35-A5E4F8248A5F" name="password" display="Password" attrs="" widget="password"/>
    <field id="uuid-6555E19E-683C-11F1-BA35-A5E4F8248A5F" key="submit" name="submit" attrs="" display="Login" value="" widget="submit"/>
  </form>
</response>