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="2C71425A-8CB4-11F1-ABA7-CECE25D43659" encoding="&#x2713;" method="post" key="login" uri="">
    <field value="" widget="text" key="username" name="username" id="uuid-2C717374-8CB4-11F1-ABA7-CECE25D43659" display="Username" attrs=""/>
    <field widget="password" name="password" key="password" display="Password" id="uuid-2C71B83E-8CB4-11F1-ABA7-CECE25D43659" attrs=""/>
    <field key="submit" display="Login" id="uuid-2C72012C-8CB4-11F1-ABA7-CECE25D43659" attrs="" name="submit" value="" widget="submit"/>
  </form>
</response>