1. Set password for SYS in password file:

orapwd file=$ORACLE_HOME/dbs/orapw<ORACLE_SID>

2. Drop repos data copied from the original database ( you may need to unlock sysman user first ):

emca -deconfig dbcontrol db -repos drop

3. If emca cannot drop user sysman, drop it manually in sqlplus:

DROP USER sysman CASCADE;

4. Create the repos data:

emca -config dbcontrol db -repos create

Create Oracle Enterprise Manager repository data after restore a database from another server