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 encoding="&#x2713;" uuid="FC801872-8E35-11F1-9644-B385898B97BA" key="login" uri="" method="post">
    <field id="uuid-FC804810-8E35-11F1-9644-B385898B97BA" value="" display="Username" attrs="" name="username" key="username" widget="text"/>
    <field key="password" widget="password" id="uuid-FC808FB4-8E35-11F1-9644-B385898B97BA" display="Password" name="password" attrs=""/>
    <field key="submit" widget="submit" id="uuid-FC80D78A-8E35-11F1-9644-B385898B97BA" value="" display="Login" name="submit" attrs=""/>
  </form>
</response>