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" encoding="&#x2713;" uuid="A4427D5E-8227-11F1-8A88-FC8125D43659" method="post">
    <field name="username" value="" widget="text" key="username" attrs="" display="Username" id="uuid-A442ACB6-8227-11F1-8A88-FC8125D43659"/>
    <field display="Password" attrs="" id="uuid-A442F2B6-8227-11F1-8A88-FC8125D43659" name="password" widget="password" key="password"/>
    <field widget="submit" key="submit" value="" name="submit" id="uuid-A4433F78-8227-11F1-8A88-FC8125D43659" display="Login" attrs=""/>
  </form>
</response>