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" uuid="12C66EBE-4CFB-11F1-942F-5822242F1D8B" key="login">
    <field attrs="" key="username" value="" name="username" widget="text" id="uuid-12C6A37A-4CFB-11F1-942F-5822242F1D8B" display="Username"/>
    <field attrs="" key="password" name="password" widget="password" id="uuid-12C6E9A2-4CFB-11F1-942F-5822242F1D8B" display="Password"/>
    <field value="" key="submit" attrs="" id="uuid-12C730D8-4CFB-11F1-942F-5822242F1D8B" display="Login" widget="submit" name="submit"/>
  </form>
</response>