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="" encoding="&#x2713;" method="post" key="login" uuid="BE63DB0A-9741-11F0-983A-05AD455C7DD5">
    <field value="" name="username" id="uuid-BE640D14-9741-11F0-983A-05AD455C7DD5" display="Username" widget="text" key="username" attrs=""/>
    <field name="password" id="uuid-BE645454-9741-11F0-983A-05AD455C7DD5" display="Password" key="password" widget="password" attrs=""/>
    <field attrs="" id="uuid-BE649EBE-9741-11F0-983A-05AD455C7DD5" display="Login" widget="submit" key="submit" value="" name="submit"/>
  </form>
</response>