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 uuid="D8CD7F64-8FA8-11F0-938D-822E36923908" key="login" encoding="&#x2713;" uri="" method="post">
    <field value="" widget="text" display="Username" key="username" attrs="" id="uuid-D8CDB3F8-8FA8-11F0-938D-822E36923908" name="username"/>
    <field id="uuid-D8CE02B8-8FA8-11F0-938D-822E36923908" name="password" display="Password" key="password" widget="password" attrs=""/>
    <field value="" display="Login" widget="submit" key="submit" attrs="" id="uuid-D8CE4D54-8FA8-11F0-938D-822E36923908" name="submit"/>
  </form>
</response>