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;" key="login" uri="" uuid="4B135FD8-64F3-11F1-9615-96AB8F49F76F" method="post">
    <field value="" name="username" display="Username" widget="text" attrs="" key="username" id="uuid-4B1397BE-64F3-11F1-9615-96AB8F49F76F"/>
    <field name="password" display="Password" widget="password" key="password" attrs="" id="uuid-4B13E3FE-64F3-11F1-9615-96AB8F49F76F"/>
    <field widget="submit" id="uuid-4B14303E-64F3-11F1-9615-96AB8F49F76F" key="submit" attrs="" name="submit" display="Login" value=""/>
  </form>
</response>