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;" uuid="6446D74A-C971-11F1-AAF2-C2170C50D6CE" method="post" key="login">
    <field name="username" display="Username" id="uuid-64470DD2-C971-11F1-AAF2-C2170C50D6CE" value="" attrs="" key="username" widget="text"/>
    <field name="password" display="Password" key="password" widget="password" id="uuid-644751DE-C971-11F1-AAF2-C2170C50D6CE" attrs=""/>
    <field attrs="" value="" id="uuid-64479D56-C971-11F1-AAF2-C2170C50D6CE" widget="submit" key="submit" display="Login" name="submit"/>
  </form>
</response>