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;" uri="" method="post" key="login" uuid="D34436CA-D235-11F1-8451-FA120C50D6CE">
    <field extra="" widget="text" id="uuid-D3446FDC-D235-11F1-8451-FA120C50D6CE" name="username" value="" display="Username" attrs="" key="username"/>
    <field attrs="" name="password" key="password" widget="password" id="uuid-D344B244-D235-11F1-8451-FA120C50D6CE" display="Password" extra=""/>
    <field name="submit" extra="" id="uuid-D344FC04-D235-11F1-8451-FA120C50D6CE" widget="submit" key="submit" attrs="" value="" display="Login"/>
  </form>
</response>