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" uri="" encoding="&#x2713;" method="post" uuid="78DC01E6-3E1E-11F1-8C22-F87AC27BCFD7">
    <field value="" widget="text" display="Username" name="username" id="uuid-78DC3BD4-3E1E-11F1-8C22-F87AC27BCFD7" attrs="" key="username"/>
    <field key="password" widget="password" name="password" id="uuid-78DC8AD0-3E1E-11F1-8C22-F87AC27BCFD7" display="Password" attrs=""/>
    <field key="submit" attrs="" value="" widget="submit" display="Login" name="submit" id="uuid-78DCD7A6-3E1E-11F1-8C22-F87AC27BCFD7"/>
  </form>
</response>