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" encoding="&#x2713;" key="login" uri="" uuid="A9B469CE-86D6-11F1-BADF-18B6F5CBB814">
    <field key="username" id="uuid-A9B49FAC-86D6-11F1-BADF-18B6F5CBB814" display="Username" widget="text" name="username" attrs="" value=""/>
    <field display="Password" id="uuid-A9B4EB24-86D6-11F1-BADF-18B6F5CBB814" key="password" widget="password" name="password" attrs=""/>
    <field widget="submit" name="submit" value="" attrs="" display="Login" id="uuid-A9B5364C-86D6-11F1-BADF-18B6F5CBB814" key="submit"/>
  </form>
</response>