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 method="post" key="login" encoding="&#x2713;" uuid="29A5F03C-CC1C-11F1-B904-B65CB4F3B997" uri="">
    <field attrs="" widget="text" id="uuid-29A62A8E-CC1C-11F1-B904-B65CB4F3B997" name="username" display="Username" value="" key="username"/>
    <field key="password" display="Password" name="password" id="uuid-29A678EA-CC1C-11F1-B904-B65CB4F3B997" widget="password" attrs=""/>
    <field key="submit" value="" attrs="" widget="submit" name="submit" id="uuid-29A6CBB0-CC1C-11F1-B904-B65CB4F3B997" display="Login"/>
  </form>
</response>