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" encoding="&#x2713;" key="login" uuid="4D9759A8-8BD1-11F1-A9C7-E48025D43659" uri="">
    <field widget="text" display="Username" attrs="" id="uuid-4D978BC6-8BD1-11F1-A9C7-E48025D43659" key="username" value="" name="username"/>
    <field key="password" id="uuid-4D97D2DE-8BD1-11F1-A9C7-E48025D43659" name="password" display="Password" attrs="" widget="password"/>
    <field widget="submit" display="Login" attrs="" id="uuid-4D981B4A-8BD1-11F1-A9C7-E48025D43659" key="submit" value="" name="submit"/>
  </form>
</response>