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 encoding="&#x2713;" method="post" uuid="F510E466-8C25-11F1-BD4D-9BB525D43659" uri="" key="login">
    <field value="" widget="text" attrs="" key="username" name="username" id="uuid-F511172E-8C25-11F1-BD4D-9BB525D43659" display="Username"/>
    <field widget="password" attrs="" name="password" display="Password" key="password" id="uuid-F5116044-8C25-11F1-BD4D-9BB525D43659"/>
    <field display="Login" attrs="" id="uuid-F511AAD6-8C25-11F1-BD4D-9BB525D43659" key="submit" name="submit" value="" widget="submit"/>
  </form>
</response>