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;" uuid="2BC46276-7AD9-11F0-BF2A-9F8162E0087B" uri="" key="login" method="post">
    <field key="username" value="" widget="text" display="Username" id="uuid-2BC490F2-7AD9-11F0-BF2A-9F8162E0087B" attrs="" name="username"/>
    <field key="password" display="Password" widget="password" name="password" id="uuid-2BC4D738-7AD9-11F0-BF2A-9F8162E0087B" attrs=""/>
    <field id="uuid-2BC52224-7AD9-11F0-BF2A-9F8162E0087B" name="submit" attrs="" value="" key="submit" widget="submit" display="Login"/>
  </form>
</response>