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" uuid="28D3639A-7AA3-11F0-9A8C-1B14B13FE236" uri="" key="login" encoding="&#x2713;">
    <field value="" key="username" display="Username" attrs="" name="username" widget="text" id="uuid-28D3964E-7AA3-11F0-9A8C-1B14B13FE236"/>
    <field widget="password" attrs="" name="password" id="uuid-28D3DB72-7AA3-11F0-9A8C-1B14B13FE236" key="password" display="Password"/>
    <field id="uuid-28D421E0-7AA3-11F0-9A8C-1B14B13FE236" widget="submit" name="submit" attrs="" key="submit" display="Login" value=""/>
  </form>
</response>