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" uri="" key="login" encoding="&#x2713;" uuid="89D39470-4420-11F1-8051-EB0E242F1D8B">
    <field display="Username" name="username" id="uuid-89D3C95E-4420-11F1-8051-EB0E242F1D8B" attrs="" key="username" value="" widget="text"/>
    <field name="password" display="Password" key="password" attrs="" id="uuid-89D40C52-4420-11F1-8051-EB0E242F1D8B" widget="password"/>
    <field name="submit" display="Login" key="submit" id="uuid-89D45400-4420-11F1-8051-EB0E242F1D8B" attrs="" widget="submit" value=""/>
  </form>
</response>