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 method="post" uri="" key="login" uuid="B8A5E2DE-8D87-11F1-AC61-9B3B898B97BA" encoding="&#x2713;">
    <field key="username" widget="text" display="Username" value="" id="uuid-B8A60EA8-8D87-11F1-AC61-9B3B898B97BA" attrs="" name="username"/>
    <field key="password" widget="password" display="Password" id="uuid-B8A65606-8D87-11F1-AC61-9B3B898B97BA" name="password" attrs=""/>
    <field widget="submit" key="submit" attrs="" name="submit" value="" display="Login" id="uuid-B8A69E2C-8D87-11F1-AC61-9B3B898B97BA"/>
  </form>
</response>