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" method="post" encoding="&#x2713;" uuid="B6F26A88-7226-11F1-9D6F-886E1BBD9EFC" uri="">
    <field key="username" widget="text" value="" display="Username" name="username" attrs="" id="uuid-B6F29C9C-7226-11F1-9D6F-886E1BBD9EFC"/>
    <field widget="password" key="password" attrs="" id="uuid-B6F2E59E-7226-11F1-9D6F-886E1BBD9EFC" display="Password" name="password"/>
    <field attrs="" id="uuid-B6F33224-7226-11F1-9D6F-886E1BBD9EFC" value="" name="submit" display="Login" widget="submit" key="submit"/>
  </form>
</response>