Start Weblogic managed-server with error The object identified by: '31' could not be found

Symptoms:
Starting the Weblogic managed-server via startManagedWebLogic.sh script get the error:
Caused by: java.rmi.NoSuchObjectException: The object identified by: '31' could not be found.  Either it was has not been exported or it has been collected by the distributed garbage collector.

Cause:
This error has several reasons, but if you search on the web or Oracle Support, the first results will be port misconfigured somewhere


Solution:
Option 1: Check the Weblogic admin server listener address if its empty: <listen-address></listen-address>
To fix:
1. Go to $DOMAIN_HOME/config/config.xml file
2. Edit config.xml and set valid listen-address for admin server.
<listen-address></listen-address>
3. Restart the server.

Option 2: The script or command to start the managed-server is wrong, it should be the Admin Server port, instead the managed-server.
Example:
$ startManagedWebLogic.sh your_managed_server t3://yourWLS:7010 &

Your AdminServer is running on port 7001 and you tried to launch on the managed-server port (7010), that's why the error.


It might have other solutions for the same message error, so if you know, let us know.

Hope this help.