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The SyncAdapter had a problem with the data it received from the server or the storage later. This problem will likely repeat if the request is tried again. The problem will need to be cleared up by either the server or the storage layer (likely with help from the user). If the SyncAdapter cleans up the data itself then it typically won't increment this value although it may still do so in order to record that it had to perform some cleanup. E.g., if the SyncAdapter received a bad entry from the server when processing a feed of entries, it may choose to drop the entry and thus make progress and still increment this value just so the SyncAdapter can record that an error occurred. This is considered a hard error.