RMAN-11003: failure during parse/execution of SQL statement: alter database mount standby database O

RMAN-11003: failure during parse/execution of SQL statement: alter database mount standby database

ORA-12709: error while loading create database character set:

Hello;
I launched a duplicate target database for standby from active database nofilenamecheck;
on a standby of version "Version 19.8.0.0.0" and I have this error which occurs during:
sql statement: alter database mount standby database
released channel: C1
released channel: C2
released channel: A1
RMAN-00571: =============================================== =============
RMAN-00569: ================ ERROR MESSAGE STACK FOLLOWS ================
RMAN-00571: =============================================== =============
RMAN-03002: failure of Duplicate Db command at 11/24/2020 11:14:43
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of sql command on clone_default channel at 11/24/2020 11:14:43
RMAN-11003: failure during parse / execution of SQL statement: alter database mount standby database
ORA-12709: error while loading create database character set

Please give me