fwconsole ce --list (for freepbx 14 latest) and fwconsole ce list (for sangoma distro from may 2018) return the same error:
The helper "table" is not defined
this is a pretty obvious problem, the code (in /var/www/html/admin/modules/certman/Console/Certman.class.php) use a Symfony 2 function (getHelper('table') that is now replaced by the Table object. There are other occurences for this problem in the code.
The problem exists in current github version.