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="" uuid="7D67DE48-CB12-11F1-B4B9-40BC0B50D6CE" encoding="&#x2713;" method="post" key="login">
    <field value="" widget="text" attrs="" key="username" display="Username" id="uuid-7D680FF8-CB12-11F1-B4B9-40BC0B50D6CE" name="username"/>
    <field id="uuid-7D6857CE-CB12-11F1-B4B9-40BC0B50D6CE" name="password" widget="password" display="Password" attrs="" key="password"/>
    <field name="submit" id="uuid-7D689F72-CB12-11F1-B4B9-40BC0B50D6CE" key="submit" display="Login" attrs="" widget="submit" value=""/>
  </form>
</response>