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="" method="post" key="login" encoding="&#x2713;" uuid="92DCB66E-7937-11F0-B1B1-51C2ED0FA296">
    <field value="" key="username" id="uuid-92DD2B12-7937-11F0-B1B1-51C2ED0FA296" display="Username" widget="text" name="username" attrs=""/>
    <field attrs="" widget="password" name="password" display="Password" id="uuid-92DD77FC-7937-11F0-B1B1-51C2ED0FA296" key="password"/>
    <field attrs="" widget="submit" name="submit" display="Login" id="uuid-92DDC77A-7937-11F0-B1B1-51C2ED0FA296" key="submit" value=""/>
  </form>
</response>