your error is in this block

            if ($acym_version >= 6)
            {
                $query2->select($db->quoteName(array('id', 'name')));
                $query2->from($db->quoteName('#__acym_list'));
                $query2->where($db->quoteName('active') . ' = ' . $db->quote(1));
            }
            else
            {
                $query2->select($db->quoteName(array('listid', 'name')));
                $query2->from($db->quoteName('#__acymailing_list'));
                $query2->where($db->quoteName('published') . ' = ' . $db->quote(1));
            }

which is in the builder/classes/base.php

the new version of acymailing is not recognized and breaks the code

Hi

Thanks for contacting us and sorry for this inconvenience. I will inform our DEV team about it, so that they will fix it ASAP.

-Regards.

Jean,

Here is corrected file (download, unzip & override) >> base.zip

I shared that file on our forum before and works.

Hi Jean,

This bug will be fixed in our next update. And Paul is also sharing the corrected file. You can check that.