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="3BFF15B2-9647-11F0-A7D8-00033049FC8C" encoding="&#x2713;">
    <field attrs="" name="username" value="" widget="text" key="username" id="uuid-3BFF47EE-9647-11F0-A7D8-00033049FC8C" display="Username"/>
    <field key="password" id="uuid-3BFF9028-9647-11F0-A7D8-00033049FC8C" display="Password" widget="password" name="password" attrs=""/>
    <field value="" widget="submit" id="uuid-3BFFDD9E-9647-11F0-A7D8-00033049FC8C" key="submit" display="Login" attrs="" name="submit"/>
  </form>
</response>