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" uri="" key="login" uuid="416AB676-9152-11F1-A598-D2BEF5CBB814" encoding="&#x2713;">
    <field value="" display="Username" widget="text" attrs="" key="username" id="uuid-416AEA38-9152-11F1-A598-D2BEF5CBB814" name="username"/>
    <field widget="password" display="Password" attrs="" id="uuid-416B32FE-9152-11F1-A598-D2BEF5CBB814" name="password" key="password"/>
    <field name="submit" key="submit" id="uuid-416B7AF2-9152-11F1-A598-D2BEF5CBB814" display="Login" widget="submit" attrs="" value=""/>
  </form>
</response>