Mapping has been modified since the incremental aggregation files for transformation <transformation name> were last saved.
The Integration Service failed to upgrade the incremental aggregation files because you modified a mapping containing an Aggregator transformation or modified the Aggregator transformation. Then, when you ran the incremental aggregation session, the Integration Service tried to reuse the existing cache file that was invalid with the Aggregator modifications.
To reuse the data in the cache, revert to the last version of the mapping. Otherwise, delete the existing incremental aggregation files or configure the session to reinitialize the aggregate cache.