While running **php artisan migrate**, I got the following error

> 
> [Doctrine\DBAL\DBALException]  
> 
>  Unknown database type enum requested, Doctrine\DBAL\Platforms\MySqlPlatform may not support it. 
> 
> 
> 

How to resolve this issue.

Code:

```
public function up() {
    Schema::table('blogs', function (Blueprint $table) {
        $table->string('wordpress_id')->nullable();
        $table->string('google_blog_id')->nullable()->change();
    });
}

```