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 uri="" method="post" encoding="&#x2713;" key="login" uuid="04A9C260-15CC-11F1-BD0B-4DE97F2D798A">
    <field attrs="" display="Username" value="" widget="text" name="username" id="uuid-04A9F582-15CC-11F1-BD0B-4DE97F2D798A" key="username"/>
    <field name="password" id="uuid-04AA3CF4-15CC-11F1-BD0B-4DE97F2D798A" key="password" attrs="" display="Password" widget="password"/>
    <field name="submit" id="uuid-04AA83F8-15CC-11F1-BD0B-4DE97F2D798A" key="submit" display="Login" attrs="" widget="submit" value=""/>
  </form>
</response>