MySQL Cannot Add Foreign Key Constraint

Question

So I\'m trying to add Foreign Key constraints to my database as a project requirement and it worked the first time or two on different tables, but I have two tables on which

Answer 1

To set a FOREIGN KEY in Table B you must set a KEY in the table A.

In table A: INDEX id (id)

And then in the table B,

CONSTRAINT `FK_id` FOREIGN KEY (`id`) REFERENCES `table-A` (`id`)