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="B152B67C-CDDF-11F1-BFDB-FDC50B50D6CE" key="login" method="post" encoding="&#x2713;">
    <field key="username" name="username" value="" display="Username" id="uuid-B152E9EE-CDDF-11F1-BFDB-FDC50B50D6CE" attrs="" widget="text"/>
    <field key="password" name="password" display="Password" id="uuid-B15337B4-CDDF-11F1-BFDB-FDC50B50D6CE" attrs="" widget="password"/>
    <field id="uuid-B1538296-CDDF-11F1-BFDB-FDC50B50D6CE" attrs="" widget="submit" key="submit" name="submit" display="Login" value=""/>
  </form>
</response>