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;" method="post" key="login" uuid="F66C17D8-183A-11EA-8BA7-55DB490E2E26">
    <field name="username" widget="text" id="uuid-F66C4F82-183A-11EA-8BA7-55DB490E2E26" key="username" value="" display="Username" attrs=""/>
    <field attrs="" id="uuid-F66C81B4-183A-11EA-8BA7-55DB490E2E26" key="password" display="Password" name="password" widget="password"/>
    <field widget="submit" name="submit" attrs="" key="submit" id="uuid-F66CB724-183A-11EA-8BA7-55DB490E2E26" value="" display="Login"/>
  </form>
</response>