OEM NAMED CREDENTIAL : java.util.HashMap cannot be cast to oracle.sysman.emSDK.sec.targetauth.EMTargetConnectionPool

On OEM, when DBA trying to browse database performance or top activity page,
The following error occurs:

java.util.HashMap cannot be cast to oracle.sysman.emSDK.sec.targetauth.EMTargetConnectionPool

Checked named credential working fine against database target, and preferred credential has been setup against database target accordingly.

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