ERROR 1558 (HY000): Column count of mysql.user is wrong.

** 에러발생 **

mysql 권한 설정 시 아래와 같은 에러 발생

ERROR 1558 (HY000): Column count of mysql.user is wrong. Expected 43, found 42. Created with MySQL 50552, 

now running 50638. Please use mysql_upgrade to fix this error.

** 해결방법 **

# mysql_upgrade -uroot -p