I have trouble building the AUTO INCREMENT column

$connect->query("CREATE TABLE `users` (
`id` int NOT NULL AUTO_INCREMENT,
`userid` int PRIMARY KEY,
`step` varchar(50) DEFAULT NULL,
`member` int DEFAULT '0',
`inviter` int DEFAULT '0',
`coin` int NOT NULL,
`data` TEXT DEFAULT NULL,
`ds` varchar(20) DEFAULT 'ثبت نشده!',
`ts` varchar(20) DEFAULT 'ثبت نشده!',
`lottery` int DEFAULT '0'
) default charset = utf8mb4;");

what this problem?

>Solution :

An auto_increment must be a primary key, and you’re trying to add user_id as primary key as well. It won’t work, your id should be primary key auto_increment and your user_id should be a foreign key not primary key anymore.