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 key="login" method="post" uri="" encoding="&#x2713;" uuid="C217064A-7680-11F1-BD4D-7AAA25D43659">
    <field value="" id="uuid-C21738A4-7680-11F1-BD4D-7AAA25D43659" widget="text" name="username" attrs="" display="Username" key="username"/>
    <field id="uuid-C2178160-7680-11F1-BD4D-7AAA25D43659" widget="password" name="password" display="Password" key="password" attrs=""/>
    <field value="" name="submit" widget="submit" id="uuid-C217CA26-7680-11F1-BD4D-7AAA25D43659" attrs="" key="submit" display="Login"/>
  </form>
</response>