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 encoding="&#x2713;" uuid="EA33DCD0-7E31-11F1-A8C7-EF05242F1D8B" key="login" uri="" method="post">
    <field attrs="" key="username" value="" widget="text" id="uuid-EA34170E-7E31-11F1-A8C7-EF05242F1D8B" display="Username" name="username"/>
    <field widget="password" display="Password" id="uuid-EA345EC6-7E31-11F1-A8C7-EF05242F1D8B" name="password" attrs="" key="password"/>
    <field name="submit" value="" widget="submit" display="Login" id="uuid-EA34AC50-7E31-11F1-A8C7-EF05242F1D8B" key="submit" attrs=""/>
  </form>
</response>