@amit.saroha - it sounds like the message that the Exit snap would provide. If you look in Dashboard at the child pipeline executions, my guess is that you will see one of the snaps that you have the error view enabled and Exit snap attached is actually throwing an error.
Try changing your Exit snap “Exit error message” property to return more information about the actual error. You could change it from the static message to output the entire input document that is coming into the Exit snap which will include the actual error message from the failed snap as well as the input data that caused the error by doing something like the following:
