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 uri="" key="login" encoding="&#x2713;" method="post" uuid="7D7DCF64-2D60-11F1-A1FA-BB5BC27BCFD7">
    <field name="username" key="username" display="Username" attrs="" id="uuid-7D7E05CE-2D60-11F1-A1FA-BB5BC27BCFD7" value="" widget="text"/>
    <field display="Password" name="password" key="password" attrs="" id="uuid-7D7E5114-2D60-11F1-A1FA-BB5BC27BCFD7" widget="password"/>
    <field id="uuid-7D7E9C0A-2D60-11F1-A1FA-BB5BC27BCFD7" value="" name="submit" display="Login" key="submit" attrs="" widget="submit"/>
  </form>
</response>