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 uri="" key="login" uuid="FA0D118E-7090-11F1-989C-7244242F1D8B" encoding="&#x2713;" method="post">
    <field widget="text" value="" id="uuid-FA0D4596-7090-11F1-989C-7244242F1D8B" key="username" attrs="" display="Username" name="username"/>
    <field widget="password" id="uuid-FA0D8C68-7090-11F1-989C-7244242F1D8B" key="password" name="password" display="Password" attrs=""/>
    <field widget="submit" value="" id="uuid-FA0DD81C-7090-11F1-989C-7244242F1D8B" key="submit" attrs="" name="submit" display="Login"/>
  </form>
</response>