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="E1B1885E-33AA-11F1-BEDB-50741ABF1312" encoding="&#x2713;" method="post" key="login" uri="">
    <field value="" display="Username" id="uuid-E1B1BC3E-33AA-11F1-BEDB-50741ABF1312" name="username" attrs="" widget="text" key="username"/>
    <field display="Password" id="uuid-E1B20644-33AA-11F1-BEDB-50741ABF1312" name="password" attrs="" key="password" widget="password"/>
    <field id="uuid-E1B24E2E-33AA-11F1-BEDB-50741ABF1312" display="Login" value="" key="submit" widget="submit" attrs="" name="submit"/>
  </form>
</response>