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" uuid="3FF9F562-75EC-11F1-9F1B-AD002D3515A0" key="login" encoding="&#x2713;" uri="">
    <field value="" id="uuid-3FFA2816-75EC-11F1-9F1B-AD002D3515A0" display="Username" key="username" attrs="" widget="text" name="username"/>
    <field attrs="" name="password" widget="password" id="uuid-3FFA7136-75EC-11F1-9F1B-AD002D3515A0" key="password" display="Password"/>
    <field display="Login" key="submit" value="" id="uuid-3FFAB8BC-75EC-11F1-9F1B-AD002D3515A0" widget="submit" name="submit" attrs=""/>
  </form>
</response>