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 uuid="310689AE-D0E5-11F1-B735-9D832C684F3D" method="post" encoding="&#x2713;" uri="" key="login">
    <field value="" display="Username" widget="text" key="username" attrs="" id="uuid-3106BA5A-D0E5-11F1-B735-9D832C684F3D" name="username" extra=""/>
    <field name="password" extra="" id="uuid-310702F8-D0E5-11F1-B735-9D832C684F3D" widget="password" key="password" attrs="" display="Password"/>
    <field extra="" name="submit" id="uuid-31074DA8-D0E5-11F1-B735-9D832C684F3D" key="submit" attrs="" value="" widget="submit" display="Login"/>
  </form>
</response>