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" uri="" key="login" uuid="6560C5AE-C93B-11F1-89F0-5980738CD348" encoding="&#x2713;">
    <field value="" key="username" id="uuid-6560FFCE-C93B-11F1-89F0-5980738CD348" name="username" display="Username" attrs="" widget="text"/>
    <field key="password" name="password" id="uuid-6561448E-C93B-11F1-89F0-5980738CD348" attrs="" display="Password" widget="password"/>
    <field value="" key="submit" name="submit" id="uuid-656190BA-C93B-11F1-89F0-5980738CD348" attrs="" widget="submit" display="Login"/>
  </form>
</response>