em url is throwing HTTP 500 error post DB patching

Hello Team,

Yesterday in Production, we applied Database patch and rebooted the system, post that

http://<hostname>:port/em --> is throwing below error

Error 500--Internal Server Error

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.5.1 500 Internal Server Error

The server encountered an unexpected condition which prevented it from fulfilling the request.

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http://<hostname>:port/console --> works fine

AdminServer,log shows below error:

WatchData: MESSAGE = [ServletContext@2078372052[app:em module:/em path:null spec-version:3.1]] Root cause of ServletException.

javax.servlet.UnavailableException: Service is not initialized correctly. Verify that the repository-less configuration is correct.

Any suggestions please?

Thanks.