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 uuid="99E4EACE-80EF-11F1-9D0F-098025D43659" method="post" key="login" encoding="&#x2713;" uri="">
    <field display="Username" value="" id="uuid-99E521F6-80EF-11F1-9D0F-098025D43659" widget="text" key="username" attrs="" name="username"/>
    <field display="Password" key="password" name="password" attrs="" widget="password" id="uuid-99E56760-80EF-11F1-9D0F-098025D43659"/>
    <field widget="submit" id="uuid-99E5AEAA-80EF-11F1-9D0F-098025D43659" key="submit" attrs="" name="submit" display="Login" value=""/>
  </form>
</response>