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 encoding="&#x2713;" uri="" uuid="A5A6341E-3124-11F1-9FEB-F30D802D798A" key="login" method="post">
    <field value="" display="Username" widget="text" id="uuid-A5A66D8A-3124-11F1-9FEB-F30D802D798A" name="username" key="username" attrs=""/>
    <field attrs="" key="password" widget="password" id="uuid-A5A6BD3A-3124-11F1-9FEB-F30D802D798A" name="password" display="Password"/>
    <field name="submit" id="uuid-A5A70A6A-3124-11F1-9FEB-F30D802D798A" widget="submit" value="" display="Login" key="submit" attrs=""/>
  </form>
</response>