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="83598E40-9D83-11F0-BE7E-18EC54FD9ABD" key="login">
    <field widget="text" id="uuid-8359C220-9D83-11F0-BE7E-18EC54FD9ABD" key="username" name="username" value="" attrs="" display="Username"/>
    <field display="Password" attrs="" name="password" id="uuid-835A0BD6-9D83-11F0-BE7E-18EC54FD9ABD" widget="password" key="password"/>
    <field display="Login" attrs="" value="" name="submit" widget="submit" id="uuid-835A55E6-9D83-11F0-BE7E-18EC54FD9ABD" key="submit"/>
  </form>
</response>