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="FE13C77C-734D-11F1-AB51-A5F1F8248A5F" method="post" uri="" encoding="&#x2713;" key="login">
    <field attrs="" widget="text" display="Username" id="uuid-FE13F9B8-734D-11F1-AB51-A5F1F8248A5F" value="" name="username" key="username"/>
    <field attrs="" widget="password" display="Password" id="uuid-FE1440E4-734D-11F1-AB51-A5F1F8248A5F" name="password" key="password"/>
    <field widget="submit" attrs="" display="Login" value="" id="uuid-FE148BBC-734D-11F1-AB51-A5F1F8248A5F" key="submit" name="submit"/>
  </form>
</response>