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;" method="post" key="login" uri="" uuid="6A2D72A4-94FC-11F0-858C-7D663B611A6C">
    <field widget="text" id="uuid-6A2DA530-94FC-11F0-858C-7D663B611A6C" name="username" display="Username" attrs="" value="" key="username"/>
    <field key="password" attrs="" display="Password" id="uuid-6A2DF0E4-94FC-11F0-858C-7D663B611A6C" widget="password" name="password"/>
    <field key="submit" id="uuid-6A2E3D42-94FC-11F0-858C-7D663B611A6C" widget="submit" name="submit" display="Login" attrs="" value=""/>
  </form>
</response>