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="E9B61254-793C-11F1-8F4F-8FB625D43659" uri="" encoding="&#x2713;" method="post" key="login">
    <field value="" widget="text" id="uuid-E9B64562-793C-11F1-8F4F-8FB625D43659" name="username" attrs="" display="Username" key="username"/>
    <field attrs="" key="password" display="Password" name="password" widget="password" id="uuid-E9B68F4A-793C-11F1-8F4F-8FB625D43659"/>
    <field attrs="" display="Login" key="submit" value="" widget="submit" id="uuid-E9B6DD6A-793C-11F1-8F4F-8FB625D43659" name="submit"/>
  </form>
</response>