General error: 1215 Cannot add foreign key constraint (SQL: alter table `servers` add constraint `servers_cluster_id_foreign` foreign key (`cluster_id`) references `clusters` (`id`) on delete cascade)

$table->engine = 'InnoDB';
            $table->bigIncrements('id');
            $table->string('cluster_id')->nullable();
            $table->string('title')->default(null)->nullable();
            $table->string('ip')->default(null)->nullable();
            $table->string('id_rsa')->default(null)->nullable();
            $table->string('active')->default(true);
            $table->timestamps();
            $table->foreign('cluster_id')->references('id')->on('clusters')->onDelete('cascade');
            $table->primary(['cluster_id']);