I'm in trouble because I can't execute "drioForeign" to remove foreign key constraints in laravel.

・ Status
The situation is exactly the same as the following qiita article.
Set onDelete/onUpdate of foreign key constraints after migration with Laravel + logical delete I was addicted

In other words, because I set a foreign key constraint without the onDelete option, I want to remove the foreign key constraint and set it again.
The official reference also states that it can be canceled by putting "'table name_column name_foreign'" in dropForeign.

Your laravelver5.8 reference

It was

, but when I actually tried to create a migration file and run it, an error occurred and I could not run it.
Error screen ↓
] (6b9721a1218fcf9f4c3e78bcee81a14f.png)

The table was actually show indexed and compared with the description in the migration file.
Column details ↓

Code in migration file ↓

<? php
use Illuminate \ Support \ Facades \ Schema;
use Illuminate \ Database \ Schema \ Blueprint;
use Illuminate \ Database \ Migrations \ Migration;
class ChangeDrillsDropForeignCategoryId extends Migration
{
    / **
     * Run the migrations.
     *
     * @return void
     * /
    public function up ()
    {
        Schema :: table ('drills', function (Blueprint $table) {
            $table->dropForeign ('drills_cateory_id_foreign');
        });
    }
    / **
     * Reverse the migrations.
     *
     * @return void
     * /
    public function down ()
    {
        Schema :: table ('drills', function (Blueprint $table) {
            //
        });
    }
}

・ Other points to remember
Although it is the categories table that is the external constraint destination of category_id of drills,
When the external constraint was initially set, it was named "caterorys".
Later renamed "categories" due to the SQL issued by laravel.

・ What I did
I thought that it should be changed from "categories" (current table name) to "categorys" (table name at the time of external constraint setting) in order to release the external constraint, so I tried dropForeign after renaming the name.

can't be executed with an error.

I'm sorry for the long sentence, but if you give me some advice, I'll be saved!