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 method="post" uri="" uuid="B73D0AFE-7459-11F1-B4BD-ADC88F49F76F" encoding="&#x2713;" key="login">
    <field name="username" value="" id="uuid-B73D3E5C-7459-11F1-B4BD-ADC88F49F76F" display="Username" key="username" widget="text" attrs=""/>
    <field name="password" key="password" id="uuid-B73D8592-7459-11F1-B4BD-ADC88F49F76F" display="Password" attrs="" widget="password"/>
    <field value="" name="submit" widget="submit" attrs="" id="uuid-B73DCFB6-7459-11F1-B4BD-ADC88F49F76F" key="submit" display="Login"/>
  </form>
</response>