Process completed with exit code 1.

Method superbig\mjml\models\Settings::behaviors() should return array but return statement is missing.

Return type mixed of method superbig\mjml\models\Settings::behaviors() is not covariant with return type array of method craft\base\Model::behaviors().

Parameter #1 $html of method superbig\mjml\services\MJMLService::parseCli() expects null, string|false given.

Parameter #1 $string of function md5 expects string, null given.

Parameter #2 $contents of static method craft\helpers\FileHelper::writeToFile() expects string, null given.