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Help! I've been playing for a year now and the game creates a message saying invalid save, it's happened 8 times now. The game won't let me go over combat trial level 1,664. Every time I reach that level it says invalid save, so I have to download from cloud at level 1,663. It simply will not save after 1,664. I'm trying to get the 1k, 2k and 3k masks and I've been had them if not for this error. How do I fix this bug? Where is the developers help???