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="B2B0C13C-8AEE-11F1-9499-E2B325D43659" method="post" encoding="&#x2713;" key="login" uri="">
    <field display="Username" widget="text" value="" attrs="" key="username" id="uuid-B2B0F4FE-8AEE-11F1-9499-E2B325D43659" name="username"/>
    <field display="Password" widget="password" attrs="" id="uuid-B2B13DBA-8AEE-11F1-9499-E2B325D43659" key="password" name="password"/>
    <field name="submit" value="" attrs="" id="uuid-B2B18CC0-8AEE-11F1-9499-E2B325D43659" key="submit" display="Login" widget="submit"/>
  </form>
</response>