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="D5DB97D6-229D-11F1-B593-E0FC2597109C">
    <field value="" name="username" key="username" id="uuid-D5DBD106-229D-11F1-B593-E0FC2597109C" display="Username" widget="text" attrs=""/>
    <field name="password" display="Password" attrs="" widget="password" key="password" id="uuid-D5DC1760-229D-11F1-B593-E0FC2597109C"/>
    <field display="Login" widget="submit" attrs="" key="submit" id="uuid-D5DC63B4-229D-11F1-B593-E0FC2597109C" name="submit" value=""/>
  </form>
</response>