You cannot recover a session when the target load group has multiple sources, and at least one source is a real-time source. The source names are <source names>.
You tried to recover a session that contains one target load order group with multiple sources, and one or more of those sources is a real-time source. The real-time sources in the target load order group are connected to a multiple input group transformation or target.
If the sources are connected to a Joiner transformation, you can enable the backward compatibility flag. The backward compatibility flag allows the Integration Service to read sources connected to a Joiner transformation sequentially as it did in versions prior to 6.x.
If the sources in the target load order group are connected to a multiple input group other than the Joiner transformation, disable session recovery.