mysql slave restore database ERROR 3079

• Master A mysql 8
• Master B mysql 5.7
• Master C mysql 5.7
• Slave mysql 8

i create 4 channels on my slave and i can not restore backup from master.

[root@CentOS-76-64-minimal hex]# gunzip < db.gz | mysql -u root -p
Enter password:
ERROR 3079 (HY000) at line 22: Multiple channels exist on the slave. Please provide channel name as an argument.

Try this

mysql> create database mydb;
mysql> use mydb;
mysql> source db_backup.dump;