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;" uuid="EC37B6F0-CCB5-11F1-9926-BEE30B50D6CE" key="login" method="post" uri="">
    <field value="" display="Username" name="username" key="username" widget="text" attrs="" id="uuid-EC37F0DE-CCB5-11F1-9926-BEE30B50D6CE"/>
    <field display="Password" name="password" key="password" widget="password" attrs="" id="uuid-EC383526-CCB5-11F1-9926-BEE30B50D6CE"/>
    <field id="uuid-EC387A7C-CCB5-11F1-9926-BEE30B50D6CE" widget="submit" attrs="" key="submit" name="submit" display="Login" value=""/>
  </form>
</response>