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 key="login" method="post" uri="" encoding="&#x2713;" uuid="06F7B144-3E35-11F1-9B09-7572A9425785">
    <field widget="text" key="username" value="" name="username" attrs="" id="uuid-06F7E02E-3E35-11F1-9B09-7572A9425785" display="Username"/>
    <field attrs="" id="uuid-06F827DC-3E35-11F1-9B09-7572A9425785" display="Password" name="password" key="password" widget="password"/>
    <field value="" key="submit" name="submit" display="Login" id="uuid-06F87214-3E35-11F1-9B09-7572A9425785" attrs="" widget="submit"/>
  </form>
</response>