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" uri="" encoding="&#x2713;" uuid="621D2420-36E5-11F1-A91E-A758C27BCFD7" key="login">
    <field key="username" attrs="" id="uuid-621D581E-36E5-11F1-A91E-A758C27BCFD7" value="" widget="text" display="Username" name="username"/>
    <field key="password" attrs="" id="uuid-621D9EB4-36E5-11F1-A91E-A758C27BCFD7" widget="password" name="password" display="Password"/>
    <field widget="submit" value="" id="uuid-621DE8BA-36E5-11F1-A91E-A758C27BCFD7" attrs="" key="submit" name="submit" display="Login"/>
  </form>
</response>