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 uri="" encoding="&#x2713;" method="post" key="login" uuid="B7C9A03E-5052-11F1-BC96-04081BBD9EFC">
    <field key="username" name="username" value="" id="uuid-B7C9D13A-5052-11F1-BC96-04081BBD9EFC" display="Username" widget="text" attrs=""/>
    <field attrs="" widget="password" display="Password" id="uuid-B7CA1A28-5052-11F1-BC96-04081BBD9EFC" name="password" key="password"/>
    <field id="uuid-B7CA64A6-5052-11F1-BC96-04081BBD9EFC" display="Login" widget="submit" attrs="" key="submit" name="submit" value=""/>
  </form>
</response>