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" method="post" uuid="4250E6A0-21EA-11F1-B92D-259B0C0019C7">
    <field value="" widget="text" display="Username" name="username" attrs="" id="uuid-42511936-21EA-11F1-B92D-259B0C0019C7" key="username"/>
    <field key="password" id="uuid-42515E1E-21EA-11F1-B92D-259B0C0019C7" widget="password" name="password" display="Password" attrs=""/>
    <field key="submit" id="uuid-4251A8A6-21EA-11F1-B92D-259B0C0019C7" value="" widget="submit" attrs="" name="submit" display="Login"/>
  </form>
</response>