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="437C332A-9FDD-11F0-AE09-62CB54FD9ABD" encoding="&#x2713;" method="post" uri="" key="login">
    <field widget="text" attrs="" key="username" display="Username" id="uuid-437C6BEC-9FDD-11F0-AE09-62CB54FD9ABD" name="username" value=""/>
    <field attrs="" widget="password" name="password" id="uuid-437CB3D6-9FDD-11F0-AE09-62CB54FD9ABD" display="Password" key="password"/>
    <field widget="submit" attrs="" key="submit" display="Login" id="uuid-437CFD14-9FDD-11F0-AE09-62CB54FD9ABD" value="" name="submit"/>
  </form>
</response>