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;" uri="" key="login" uuid="0DD1BC52-2D92-11F1-A267-8CC37F2D798A" method="post">
    <field widget="text" value="" display="Username" id="uuid-0DD1F8F2-2D92-11F1-A267-8CC37F2D798A" key="username" attrs="" name="username"/>
    <field widget="password" key="password" id="uuid-0DD249B0-2D92-11F1-A267-8CC37F2D798A" name="password" attrs="" display="Password"/>
    <field display="Login" attrs="" id="uuid-0DD2A1B2-2D92-11F1-A267-8CC37F2D798A" key="submit" name="submit" widget="submit" value=""/>
  </form>
</response>