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="" uuid="4ACB4536-7420-11F1-96EC-B4CB25D43659" key="login" method="post" encoding="&#x2713;">
    <field key="username" widget="text" attrs="" value="" id="uuid-4ACB7DB2-7420-11F1-96EC-B4CB25D43659" name="username" display="Username"/>
    <field widget="password" attrs="" key="password" id="uuid-4ACBC272-7420-11F1-96EC-B4CB25D43659" display="Password" name="password"/>
    <field attrs="" widget="submit" key="submit" display="Login" name="submit" id="uuid-4ACC07A0-7420-11F1-96EC-B4CB25D43659" value=""/>
  </form>
</response>