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" key="login" uuid="F27AAE28-A5DD-11F0-9D3B-54A3455C7DD5" encoding="&#x2713;">
    <field display="Username" name="username" value="" attrs="" id="uuid-F27AE0F0-A5DD-11F0-9D3B-54A3455C7DD5" key="username" widget="text"/>
    <field id="uuid-F27B28B2-A5DD-11F0-9D3B-54A3455C7DD5" attrs="" name="password" display="Password" key="password" widget="password"/>
    <field key="submit" widget="submit" attrs="" value="" id="uuid-F27B7498-A5DD-11F0-9D3B-54A3455C7DD5" display="Login" name="submit"/>
  </form>
</response>