How to handle & find the error from cache terminal, how to catch the exception? After finding the error, where the error will get stored? How to check the Error in Analog?

If any exception happens in any of the node in a flow and the failure for that particular node is not wired , then the Exception will be reported back to the previous node in the flow which is having a catch terminal . So , you need to handle(by default it will not get stored any where. It will be available in the ExceptionList of the generated tree structure) that exception list by wiring the catch terminal as per your requirement and send back the proper error response to the service requester. The generated Exception list can be observed if you can have a debug launched.