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="2BD30F0C-7D61-11F1-A83C-AC3D242F1D8B" key="login" encoding="&#x2713;" method="post" uri="">
    <field value="" widget="text" display="Username" id="uuid-2BD349FE-7D61-11F1-A83C-AC3D242F1D8B" name="username" attrs="" key="username"/>
    <field widget="password" id="uuid-2BD3985A-7D61-11F1-A83C-AC3D242F1D8B" display="Password" name="password" attrs="" key="password"/>
    <field name="submit" value="" widget="submit" display="Login" id="uuid-2BD3E71A-7D61-11F1-A83C-AC3D242F1D8B" key="submit" attrs=""/>
  </form>
</response>