SQLSTATE[42S02]: Base table or view not found: 1146 Table doesn't exist (SQL: alter table `orders` add index `orders_id_index`(`id`)) code example

Example: SQLSTATE[42S02]: Base table or view not found: 1146 Tabl

It seems Laravel is trying to use category_posts table (because of many-to-many relationship). But you don't have this table, because you've created category_post table. Change name of the table to category_posts.