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You have the All_Campaigns mod for NVS on the A2C2M3 map with some changes. That fix should probably be integrated into NVS_ImportObjects (this package has problematic mercury), and only the script from all campaigns in the fix should be copied. Open the map using Notepad from the mod for all campaigns, search for windmill_mercury, and replace the highlighted part with sulfur and Sulfur respectively. If the changes in the map are minor, you can replace it in the problematic package after changing the resource in it.