I am starting to use MySQL Workbench tool especially for data modeling. So, the first I would like to do is reverse engineering of my existing database on web server. But I
I am using Centos 6.5 for Server purposes. And Mysql Workbench for ERR Diagram. I got the same error. Answers above did not work for me.
This answer is based on changing data type for comment column. And works like charm.
Connect mysql from console.
use mysql;
show create table mysql.proc;
Then look for comment column. If it's datatype is char, change to text.
You can also use any other gui for making changes.