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" key="login" uuid="616F4928-F297-11F0-A217-29551ABF1312" uri="" encoding="&#x2713;">
    <field widget="text" id="uuid-616F7D94-F297-11F0-A217-29551ABF1312" key="username" value="" display="Username" attrs="" name="username"/>
    <field widget="password" id="uuid-616FC6D2-F297-11F0-A217-29551ABF1312" key="password" attrs="" name="password" display="Password"/>
    <field value="" key="submit" display="Login" name="submit" attrs="" widget="submit" id="uuid-61701312-F297-11F0-A217-29551ABF1312"/>
  </form>
</response>