laravel-permission 执行migrate 报数据库建表错误

laravel-permission创建数据表时报错导致无法继续运行## 标题文字

$tableNames = config('permission.table_names');

        Schema::create($tableNames['permissions'], function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('guard_name');
            $table->timestamps();
        });

        Schema::create($tableNames['roles'], function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('guard_name');
            $table->timestamps();
        });

        Schema::create($tableNames['model_has_permissions'], function (Blueprint $table) use ($tableNames) {
            $table->integer('permission_id')->unsigned();
            $table->morphs('model');

            $table->foreign('permission_id')
                ->references('id')
                ->on($tableNames['permissions'])
                ->onDelete('cascade');

            $table->primary(['permission_id', 'model_id', 'model_type']);
        });

        Schema::create($tableNames['model_has_roles'], function (Blueprint $table) use ($tableNames) {
            $table->integer('role_id')->unsigned();
            $table->morphs('model');

            $table->foreign('role_id')
                ->references('id')
                ->on($tableNames['roles'])
                ->onDelete('cascade');

            $table->primary(['role_id', 'model_id', 'model_type']);
        });

        Schema::create($tableNames['role_has_permissions'], function (Blueprint $table) use ($tableNames) {
            $table->integer('permission_id')->unsigned();
            $table->integer('role_id')->unsigned();
            $table->foreign('permission_id')
                ->references('id')
                ->on($tableNames['permissions'])
                ->onDelete('cascade');

            $table->foreign('role_id')
                ->references('id')
                ->on($tableNames['roles'])
                ->onDelete('cascade');

            $table->primary(['permission_id', 'role_id']);

            app('cache')->forget('spatie.permission.cache');
        });

以上报错的备份集中在unsigned 以及references 中 我没改过他的任何东西
我的版本是laravel5.5 扩展版本是 "spatie/laravel-permission": "^2.9"

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