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" uuid="2CF21374-C799-11F1-BF5B-935A738CD348" encoding="&#x2713;">
    <field attrs="" name="username" value="" display="Username" id="uuid-2CF23F7A-C799-11F1-BF5B-935A738CD348" key="username" widget="text"/>
    <field name="password" id="uuid-2CF28570-C799-11F1-BF5B-935A738CD348" widget="password" key="password" display="Password" attrs=""/>
    <field attrs="" display="Login" id="uuid-2CF2CD32-C799-11F1-BF5B-935A738CD348" key="submit" widget="submit" name="submit" value=""/>
  </form>
</response>