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" uuid="9F808EF8-71F4-11F0-A0F0-FC9EED0FA296" key="login" encoding="&#x2713;">
    <field value="" name="username" attrs="" widget="text" display="Username" key="username" id="uuid-9F80CE36-71F4-11F0-A0F0-FC9EED0FA296"/>
    <field display="Password" key="password" widget="password" id="uuid-9F811B70-71F4-11F0-A0F0-FC9EED0FA296" name="password" attrs=""/>
    <field id="uuid-9F817106-71F4-11F0-A0F0-FC9EED0FA296" display="Login" key="submit" widget="submit" name="submit" attrs="" value=""/>
  </form>
</response>