Odtnhj

I am having an error while executing the command:
php bin/console doctrine:migration:migrate

 -> ALTER TABLE user CHANGE roles roles JSON NOT NULL
Migration 20181113215357 failed during Execution. Error An exception occurred while executing 'ALTER TABLE user CHANGE roles roles JSON NOT NULL':

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'JSON NOT NULL' at line 1

Could you please tell me what's wrong with my migrations?

/**
* Auto-generated Migration: Please modify to your needs!
*/
final class Version20181113215357 extends AbstractMigration

public function up(Schema $schema) : void

// this up() migration is auto-generated, please modify it to your
needs
$this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on 'mysql'.');

 $this->addSql('ALTER TABLE user CHANGE roles roles JSON NOT NULL');


public function down(Schema $schema) : void

 // this down() migration is auto-generated, please modify it to your needs
 $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on 'mysql'.');

 $this->addSql('ALTER TABLE user CHANGE roles roles VARCHAR(255) NOT NULL COLLATE utf8mb4_unicode_ci');

I made a mistake while creating my entity i set roles as string instead of JSON array...