Hi Avichal,
This is a one time activity if you do not undeploy MII or MEINT at any point in time. From what you are saying it appears that you have either undeployed and re-deployed MII. Or you have undeployed MEINT from your system.
You can check if MEINT is deployed by navigating to System Resources -> Custom Actions within MII. If you see sap.com~xapps~me~integration~action~actions.mii-actions.jar, it means MEINT classes exist within MII server. Else they are lost.
Regards,
Anushree