In this post, you’ll learn more about the Oracle ErrorTNS-01179: Listener cannot load instance class “string” with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
TNS-01179: Listener cannot load instance class “string”
Reason for the Error TNS-01179: Listener cannot load instance class “string”
Cause: Instance tried to register as a class unknown to listener.
How to fix the Error TNS-01179: Listener cannot load instance class “string” ?
You can fix this error in Oracle by following the below steps
Action: check LISTENER.ORA and/or instance configuration, and reference platform documentation to find the instance classes available for the listener on this platform.