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 uri="" method="post" key="login" encoding="&#x2713;" uuid="73B72CC4-C841-11F1-B0FD-F8A2738CD348">
    <field value="" name="username" id="uuid-73B75B36-C841-11F1-B0FD-F8A2738CD348" key="username" widget="text" display="Username" attrs=""/>
    <field name="password" widget="password" id="uuid-73B7A046-C841-11F1-B0FD-F8A2738CD348" key="password" display="Password" attrs=""/>
    <field widget="submit" id="uuid-73B7E7F4-C841-11F1-B0FD-F8A2738CD348" key="submit" display="Login" value="" name="submit" attrs=""/>
  </form>
</response>