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 key="login" method="post" uuid="F2BC0A02-A4FD-11F0-AC18-6B04DBBCD7F8" uri="" encoding="&#x2713;">
    <field value="" widget="text" name="username" key="username" attrs="" id="uuid-F2BC3FEA-A4FD-11F0-AC18-6B04DBBCD7F8" display="Username"/>
    <field name="password" widget="password" display="Password" id="uuid-F2BC8D10-A4FD-11F0-AC18-6B04DBBCD7F8" key="password" attrs=""/>
    <field widget="submit" value="" name="submit" attrs="" key="submit" display="Login" id="uuid-F2BCD888-A4FD-11F0-AC18-6B04DBBCD7F8"/>
  </form>
</response>