Unknown column 'isys_cats_person_list__unmigrated_password'

If this error message appears when updating i-doit, then you have to do the following:

You connect to the database via mysql -uroot -p and select the idoit_data database with use idoit_data;
Then run the following command:

ALTER TABLE `isys_cats_person_list`
ADD `isys_cats_person_list__unmigrated_password` tinyint(1) NOT NULL DEFAULT 0;

Then run the update again. This should fix the error.