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" uuid="3D43B9BA-4FFF-11F1-871E-C640242F1D8B" uri="" key="login" encoding="&#x2713;">
    <field attrs="" name="username" id="uuid-3D43EE76-4FFF-11F1-871E-C640242F1D8B" display="Username" value="" key="username" widget="text"/>
    <field display="Password" attrs="" id="uuid-3D4436A6-4FFF-11F1-871E-C640242F1D8B" name="password" widget="password" key="password"/>
    <field display="Login" value="" attrs="" id="uuid-3D448124-4FFF-11F1-871E-C640242F1D8B" name="submit" widget="submit" key="submit"/>
  </form>
</response>