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="97B8CA06-6C70-11F1-8E40-3E3A242F1D8B" encoding="&#x2713;">
    <field attrs="" display="Username" value="" widget="text" id="uuid-97B8FDDC-6C70-11F1-8E40-3E3A242F1D8B" name="username" key="username"/>
    <field name="password" key="password" widget="password" id="uuid-97B94094-6C70-11F1-8E40-3E3A242F1D8B" display="Password" attrs=""/>
    <field display="Login" attrs="" value="" id="uuid-97B988D8-6C70-11F1-8E40-3E3A242F1D8B" widget="submit" key="submit" name="submit"/>
  </form>
</response>