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 key="login" method="post" encoding="&#x2713;" uri="" uuid="EDD254AE-897E-11F1-8AA4-E752FD48BEF4">
    <field key="username" name="username" id="uuid-EDD28B90-897E-11F1-8AA4-E752FD48BEF4" display="Username" widget="text" attrs="" value=""/>
    <field id="uuid-EDD2D55A-897E-11F1-8AA4-E752FD48BEF4" display="Password" name="password" key="password" attrs="" widget="password"/>
    <field key="submit" display="Login" id="uuid-EDD3208C-897E-11F1-8AA4-E752FD48BEF4" name="submit" attrs="" widget="submit" value=""/>
  </form>
</response>