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="F51981B4-77AF-11F1-A91D-B3A725D43659" method="post" key="login">
    <field widget="text" id="uuid-F519B51C-77AF-11F1-A91D-B3A725D43659" name="username" value="" display="Username" key="username" attrs=""/>
    <field id="uuid-F519FD06-77AF-11F1-A91D-B3A725D43659" widget="password" name="password" attrs="" display="Password" key="password"/>
    <field attrs="" display="Login" key="submit" value="" id="uuid-F51A473E-77AF-11F1-A91D-B3A725D43659" widget="submit" name="submit"/>
  </form>
</response>