after i have exported the data from my source database which is 12cR1 and imported the dump to the destination database which is 11gR2 , i faced the below error:

Copyright (c) 1982, 2011, Oracle and/or its affiliates.  All rights reserved.

;;;

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 – 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

ORA-39000: bad dump file specification

ORA-39142: incompatible version number 4.1 in dump file “/export/dir/test.dmp”

In order to fix this error,  you need to lower the exported dump version using the “version” parameter from the source 12cR1 database, using the command:

nohup $ORACLE_HOME/bin/expdp “‘/as sysdba ‘”  DIRECTORY=DIR DUMPFILE=test.dmp  TABLES=sch1.test_table version=11.2 logfile=test_exp.log &

remark: nohup will let the expdp command execute on the background.

so the trick is to add the “version” parameter