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 uri="" encoding="&#x2713;" method="post" key="login" uuid="51D6C384-86E8-11F1-AAE3-405EFD48BEF4">
    <field attrs="" widget="text" value="" key="username" id="uuid-51D6FCD2-86E8-11F1-AAE3-405EFD48BEF4" display="Username" name="username"/>
    <field name="password" id="uuid-51D74304-86E8-11F1-AAE3-405EFD48BEF4" display="Password" key="password" widget="password" attrs=""/>
    <field value="" widget="submit" attrs="" name="submit" id="uuid-51D78B48-86E8-11F1-AAE3-405EFD48BEF4" display="Login" key="submit"/>
  </form>
</response>