Can't create table with error no : 150 - mysql

Question

I am using the below create table to create a posts table in mysql :
mysql> create table posts(
-> post_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> author_id INT NOT NULL,
-> title varchar(50),
-> post TEXT,
-> data DATE,
-> FOREIGN KEY (author_id)
-> REFERENCES authors(author_id)
-> ON DELETE RESTRICT)ENGINE=INNODB;
But i always get this error:
ERROR 1005 (HY000): Can't create table 'myFirstBlog.posts' (errno: 150)
The describe of my authors table is as follows:
mysql> desc authors;
+-----------+-------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+----------------+
| author_id | int(11) | NO | PRI | NULL | auto_increment |
| user_name | varchar(16) | YES | | NULL | |
| password | varchar(40) | YES | | NULL | |
+-----------+-------------+------+-----+---------+----------------+
3 rows in set (0.00 sec)
Can someone please help me with where the error is .
Thanks in advance.

Answer 1

create table posts(
post_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
author_id INT NOT NULL,
title varchar(50),
post TEXT,
data DATE,
FOREIGN KEY (author_id)
REFERENCES authors(author_id)
ON DELETE RESTRICT
)ENGINE=INNODB;
Kindly make datatype of both table's column same.
authors(author_id) and post(author_id)
Or
Make authors table first and then execute above query.
I had tried below query it's worked for me.
create table posts(
post_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
author_id INT NOT NULL,
title varchar(50),
post TEXT,
data DATE,
FOREIGN KEY (author_id)
REFERENCES labels(id)
ON DELETE RESTRICT
)ENGINE=INNODB;
Hope this will helps.