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 uuid="E15A9C64-89A0-11F1-89F5-125BFD48BEF4" uri="" key="login" encoding="&#x2713;" method="post">
    <field attrs="" widget="text" value="" key="username" id="uuid-E15ACE5A-89A0-11F1-89F5-125BFD48BEF4" display="Username" name="username"/>
    <field widget="password" attrs="" key="password" name="password" id="uuid-E15B15CC-89A0-11F1-89F5-125BFD48BEF4" display="Password"/>
    <field name="submit" display="Login" id="uuid-E15B5F50-89A0-11F1-89F5-125BFD48BEF4" key="submit" value="" widget="submit" attrs=""/>
  </form>
</response>