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" uuid="892F255C-410F-11F1-80E8-C6A40C0019C7" uri="" key="login" encoding="&#x2713;">
    <field widget="text" attrs="" id="uuid-892F4D48-410F-11F1-80E8-C6A40C0019C7" key="username" name="username" value="" display="Username"/>
    <field key="password" id="uuid-892F883A-410F-11F1-80E8-C6A40C0019C7" attrs="" widget="password" name="password" display="Password"/>
    <field name="submit" value="" display="Login" widget="submit" id="uuid-892FC5FC-410F-11F1-80E8-C6A40C0019C7" attrs="" key="submit"/>
  </form>
</response>