wyUpdate exits prematurely

We are using AutomaticUpdater.dll and wyUpdate.exe of version 2.6.18.4.Updates are done using AutomaticUpdaterBackend.We call ForceCheckForUpdates but the updateStep at the time of invoking is "Nothing"One update works successfully after which the following error starts to comewyUpdate exited prematurely : wyUpdate failed to start

There is no problem of disk space or RAM crunch due to which wyUpdate is forced to stop.

Any help is immensely appreciated

We need a whole lot more information to even begin to help.

>> "One update works successfully after which the following error starts to come"

What do you mean? Are you saying you are updating multiple apps from a single instance of wyUpdate / AutomaticUpdater? Don't do that. The AutomaticUpdater wasn't designed to do that. It assumes you're only updating 1 app (your app), not multiple apps.