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" key="login" uri="" uuid="31C48694-6E29-11F1-8CEF-A28525D43659" encoding="&#x2713;">
    <field id="uuid-31C4B722-6E29-11F1-8CEF-A28525D43659" value="" key="username" widget="text" display="Username" attrs="" name="username"/>
    <field name="password" attrs="" display="Password" key="password" widget="password" id="uuid-31C50060-6E29-11F1-8CEF-A28525D43659"/>
    <field name="submit" display="Login" attrs="" widget="submit" key="submit" value="" id="uuid-31C54A20-6E29-11F1-8CEF-A28525D43659"/>
  </form>
</response>