Oracle EBS Concurrent Manager Troubleshooting

In Oracle EBS version 12.2.6, Internal concurrent manager had an unexpected Outage.
ICM logfile has the error message  ORA-04068: existing state of packages has been discarded
====================

Shutting down Internal Concurrent Manager : 30-JAN-2018 12:09:54

List of errors encountered:
.............................................................................

_ 1 _
Error in DBMS lock request by handle. (ROUTINE=AFPGMG) (REASON=ORACLE
error 4068 in afpdlrh

Cause: afpdlrh failed due to ORA-04068: existing state of packages has
been discarded
ORA-04061: existing state of package body "APPS.FND_DCP" has been
invalidate


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Issue Resolution

1. Shut down the Concurrent manager completely using adcmctl.sh

cd $ADMIN_SCRIPTS_HOME

adcmctl.sh stop apps/<appspassword>

2. Compile the invalids in database

SQL>alter package FND_DCP compile body;

OR

Run the utlrp.sql script to recompile all the invalid objects in the database.

3. Startup Concurrent manager using adcmctl.sh

cd $ADMIN_SCRIPTS_HOME

adcmctl.sh start apps/<appspassword>

4. Verify Oracle EBS Concurrent manager is running fine.