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 key="login" method="post" encoding="&#x2713;" uuid="E185E27E-31A4-11F1-B679-5259C27BCFD7" uri="">
    <field attrs="" key="username" value="" name="username" widget="text" id="uuid-E18615AA-31A4-11F1-B679-5259C27BCFD7" display="Username"/>
    <field key="password" attrs="" id="uuid-E1865BC8-31A4-11F1-B679-5259C27BCFD7" display="Password" name="password" widget="password"/>
    <field name="submit" widget="submit" display="Login" id="uuid-E186A3F8-31A4-11F1-B679-5259C27BCFD7" attrs="" key="submit" value=""/>
  </form>
</response>