php artisan migrateができない

前提・実現したいこと

laravelとvue.jsでポートフォリオを作成しています。migrationをしたいのですが、エラーが出てしまいます。
以前はできていましたがデプロイを行ってから何故かできなくなってしまいました。

発生している問題・エラーメッセージ

root@c59ef3e3d59a:/work/backend# php artisan migrate

   BadMethodCallException  : Method Illuminate\Database\Schema\Blueprint::string does not exist.

  at /work/backend/vendor/laravel/framework/src/Illuminate/Support/Traits/Macroable.php:103
     99|      */
    100|     public function __call($method, $parameters)
    101|     {
    102|         if (! static::hasMacro($method)) {
  > 103|             throw new BadMethodCallException(sprintf(
    104|                 'Method %s::%s does not exist.', static::class, $method
    105|             ));
    106|         }
    107| 

  Exception trace:

  1   Illuminate\Database\Schema\Blueprint::__call("string")
      /work/backend/vendor/laravel/framework/src/Illuminate/Database/Migrations/DatabaseMigrationRepository.php:155

  2   Illuminate\Database\Migrations\DatabaseMigrationRepository::Illuminate\Database\Migrations\{closure}(Object(Illuminate\Database\Schema\Blueprint))
      /work/backend/vendor/laravel/framework/src/Illuminate/Database/Schema/Builder.php:166

  Please use the argument -v to see more details.

該当のソースコード

####マイグレーションファイル

php
1<?php
2
3use Illuminate\Database\Migrations\Migration;
4use Illuminate\Database\Schema\Blueprint;
5use Illuminate\Support\Facades\Schema;
6use Illuminate\Validation\Rules\Unique;
7
8class CreateUsersTable extends Migration
9{
10    /**
11     * Run the migrations.
12     *
13     * @return void
14     */
15    public function up()
16    {
17        Schema::create('users', function (Blueprint $table) {
18            $table->bigIncrements('id');
19            $table->string('name')->unique();
20            $table->string('email')->unique();
21            $table->timestamp('email_verified_at')->nullable();
22            $table->string('password')->nullable();
23            $table->rememberToken();
24            $table->timestamps();
25        });
26    }
27
28    /**
29     * Reverse the migrations.
30     *
31     * @return void
32     */
33    public function down()
34    {
35        Schema::dropIfExists('users');
36    }
37}
38

php
1<?php
2
3use Illuminate\Database\Migrations\Migration;
4use Illuminate\Database\Schema\Blueprint;
5use Illuminate\Support\Facades\Schema;
6
7class CreateQuestionsTable extends Migration
8{
9    /**
10     * Run the migrations.
11     *
12     * @return void
13     */
14    public function up()
15    {
16        Schema::create('questions', function (Blueprint $table) {
17            $table->bigIncrements('id');
18            $table->text('title');
19            $table->text('body');
20            $table->boolean('solution')->default(false);
21            $table->bigInteger('user_id');
22            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
23            $table->timestamps();
24        });
25    }
26
27    /**
28     * Reverse the migrations.
29     *
30     * @return void
31     */
32    public function down()
33    {
34        Schema::dropIfExists('questions');
35    }
36}
37

php
1<?php
2
3use Illuminate\Database\Migrations\Migration;
4use Illuminate\Database\Schema\Blueprint;
5use Illuminate\Support\Facades\Schema;
6
7class CreateAnswersTable extends Migration
8{
9    /**
10     * Run the migrations.
11     *
12     * @return void
13     */
14    public function up()
15    {
16        Schema::create('answers', function (Blueprint $table) {
17            $table->bigIncrements('id');
18            $table->text('body');
19            $table->bigInteger('user_id');
20            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
21            $table->bigInteger('question_id');
22            $table->foreign('question_id')->references('id')->on('questions')->onDelete('cascade');
23            $table->timestamps();
24        });
25    }
26
27    /**
28     * Reverse the migrations.
29     *
30     * @return void
31     */
32    public function down()
33    {
34        Schema::dropIfExists('answers');
35    }
36}
37

php
1<?php
2
3use Illuminate\Database\Migrations\Migration;
4use Illuminate\Database\Schema\Blueprint;
5use Illuminate\Support\Facades\Schema;
6
7class CreateSympathiesTable extends Migration
8{
9    /**
10     * Run the migrations.
11     *
12     * @return void
13     */
14    public function up()
15    {
16        Schema::create('likes', function (Blueprint $table) {
17            $table->bigIncrements('id');
18            $table->bigInteger('user_id');
19            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
20            $table->bigInteger('question_id');
21            $table->foreign('question_id')->references('id')->on('questions')->onDelete('cascade');
22            $table->timestamps();
23        });
24    }
25
26    /**
27     * Reverse the migrations.
28     *
29     * @return void
30     */
31    public function down()
32    {
33        Schema::dropIfExists('sympathies');
34    }
35}
36