In this post, you’ll learn more about the Oracle ErrorORA-16556: observer version mismatch with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-16556: observer version mismatch
Reason for the Error ORA-16556: observer version mismatch
This version of the observer was incompatible with the version of the specified Oracle database server to which the observer had been connected. This observer client cannot be used to observe the specified Oracle server.
How to fix the Error ORA-16556: observer version mismatch ?
You can fix this error in Oracle by following the below steps
Use a version of the observer that is compatible with the Oracle database server to be observed.