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="" key="login" method="post" encoding="&#x2713;" uuid="C9F0FCA4-1618-11F1-844E-87B60C0019C7">
    <field value="" key="username" widget="text" name="username" id="uuid-C9F12C06-1618-11F1-844E-87B60C0019C7" display="Username" attrs=""/>
    <field key="password" widget="password" name="password" id="uuid-C9F17512-1618-11F1-844E-87B60C0019C7" display="Password" attrs=""/>
    <field display="Login" attrs="" id="uuid-C9F1C080-1618-11F1-844E-87B60C0019C7" key="submit" name="submit" widget="submit" value=""/>
  </form>
</response>