hi am having this issue
impdp username/password@dbname schemas=username directory=images dumpfile=username.dmp logfile=impdpnato.log version=18.0.0
Import: Release 18.0.0.0.0 - Production on Thu May 27 16:43:31 2021
Version 18.3.0.0.0
Copyright (c) 1982, 2018, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production
ORA-39002: invalid operation
ORA-39358: Export dump file version 19.0.0.0.0 not compatible with target version 18.1.0.0.0
bash-4.1$ impdp username/password@dbname schemas=username directory=images dumpfile=username.dmp logfile=impdpnato.log version=18.1.0
Import: Release 18.0.0.0.0 - Production on Thu May 27 16:44:49 2021
Version 18.3.0.0.0
Copyright (c) 1982, 2018, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production
ORA-39002: invalid operation
ORA-39358: Export dump file version 19.0.0.0.0 not compatible with target version 18.1.0
bash-4.1$ impdp username/password@dbname schemas=username directory=images dumpfile=username.dmp logfile=impdpnato.log version=19.0.0
Import: Release 18.0.0.0.0 - Production on Thu May 27 16:46:09 2021
Version 18.3.0.0.0
Copyright (c) 1982, 2018, Oracle and/or its affiliates. All rights reserved.
Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production
ORA-39002: invalid operation
bash-4.1$