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="AF49ABEA-4C3B-11F1-8FC4-CF5F242F1D8B">
    <field attrs="" value="" key="username" name="username" display="Username" id="uuid-AF49E57E-4C3B-11F1-8FC4-CF5F242F1D8B" widget="text"/>
    <field widget="password" display="Password" id="uuid-AF4A2962-4C3B-11F1-8FC4-CF5F242F1D8B" name="password" key="password" attrs=""/>
    <field display="Login" id="uuid-AF4A7502-4C3B-11F1-8FC4-CF5F242F1D8B" widget="submit" name="submit" value="" key="submit" attrs=""/>
  </form>
</response>