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" method="post" encoding="&#x2713;" uuid="15DC61C0-973F-11F0-B31D-75FCDABCD7F8">
    <field display="Username" value="" widget="text" name="username" key="username" id="uuid-15DC9C26-973F-11F0-B31D-75FCDABCD7F8" attrs=""/>
    <field name="password" id="uuid-15DCE60E-973F-11F0-B31D-75FCDABCD7F8" key="password" attrs="" display="Password" widget="password"/>
    <field widget="submit" value="" display="Login" attrs="" key="submit" id="uuid-15DD32A8-973F-11F0-B31D-75FCDABCD7F8" name="submit"/>
  </form>
</response>