OIC Integration failed in activation with error as Failed to located the service endpoint.

Last activation attempt failed.

{0}. ; Failed to located the service endpoint for the service https://hcm host:443/hcmRestApi/resources/11.13.18.05/workers. Please contact the administrator.

Last activation attempt failed.

{0}. ; Failed to located the service endpoint for the service https://hcm host:443/hcmRestApi/resources/11.13.18.05/userAccounts. Please contact the administrator

I have used HCM cloud adapter connection and used Rest business service object there . so after this error when I did Refresh metadata on connection then now suddenly not able to see userAccount and worker object itself while using that connection in my integration config. and same error still while activating integration.