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="" method="post" key="login" uuid="C439A882-7335-11F0-BD40-0182ED0FA296">
    <field value="" attrs="" name="username" display="Username" id="uuid-C439E414-7335-11F0-BD40-0182ED0FA296" key="username" widget="text"/>
    <field widget="password" id="uuid-C43A33CE-7335-11F0-BD40-0182ED0FA296" key="password" display="Password" name="password" attrs=""/>
    <field id="uuid-C43A8504-7335-11F0-BD40-0182ED0FA296" key="submit" widget="submit" attrs="" value="" display="Login" name="submit"/>
  </form>
</response>