mysql添加用户失败怎么办

C:\Program Files\MySQL\MySQL Server 8.0\bin>

C:\Program Files\MySQL\MySQL Server 8.0\bin>mysql -uroot -p
Enter password: ********

mysql> use mysql;
Database changed
mysql> delete from user where user='gao'; #用常规方式删除一遍，防止之前建立了隐藏用户导致的无法创建成功
Query OK, 1 row affected (0.30 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.04 sec)
mysql> create user gao@localhost identified by '1998';#开始创建用户
Query OK, 0 rows affected (0.09 sec)
mysql> flush privileges;#刷新权利
Query OK, 0 rows affected (0.04 sec)
mysql> quit
Bye