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 key="login" uri="" method="post" uuid="5612E592-3010-11F1-A23C-7ECD0C0019C7" encoding="&#x2713;">
    <field key="username" name="username" attrs="" value="" id="uuid-561316D4-3010-11F1-A23C-7ECD0C0019C7" widget="text" display="Username"/>
    <field key="password" name="password" attrs="" id="uuid-56135FAE-3010-11F1-A23C-7ECD0C0019C7" display="Password" widget="password"/>
    <field id="uuid-5613A978-3010-11F1-A23C-7ECD0C0019C7" widget="submit" display="Login" key="submit" name="submit" attrs="" value=""/>
  </form>
</response>