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Title says all. What engine do you use to make the game?

The file is missing from Mega. What happened?

Is it possible to create knowledges? I'm making a mod and I want to add magic_usage as a knowledge, but it keeps telling me it can't find a knowledge with that ID when I create a new world.
Here's my Discoveries.json:

{
  "discoveries": [
    {
      "id": "magic_practice",
      "name": "magic practice",
      "gainConditions": ["[NOT]group_has_knowledge:magic_usage", "[ANY_N_CELL]cell_layer_value:ether,1"],
      "holdConditions": ["group_has_knowledge:magic_usage,0.1"],
      "gainEffects": ["add_group_knowledge:magic_usage,30", "add_group_skill:magic_using"],
      "lossEffects": ["remove_group_knowledge:magic_usage", "remove_group_skill:magic_using"],
      "eventTimeToTrigger": 912500
    }
  ]
}

and here's the log:

Running Worlds 0.3.3 (WindowsPlayer Release)...
Trying to generate world with seed: 1505703510, Altitude Scale: 0.75, Sea Level Offset: 0, River Strength: 0.5, Avg. Temperature: 13.7, Avg. Rainfall: 990
Exception: Discovery: Unable to find knowledge with Id: magic_usage
    Discovery.InitializeOnKnowledgeCondition (Condition c) (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Discovery.InitializeOnConditions (Condition[] conditions) (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Discovery.Initialize () (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Discovery.InitializeDiscoveries () (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Manager.LoadMods (System.Collections.Generic.ICollection`1[T] paths) (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Manager.TryLoadActiveMods () (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Manager.GenerateNewWorld (System.Int32 seed, UnityEngine.Texture2D heightmap) (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Manager+<>c__DisplayClass238_0.<GenerateNewWorldAsync>b__1 (System.Object state) (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Rethrow as Exception: Unhandled exception in GenerateNewWorld with seed: 1505703510
    Manager+<>c__DisplayClass238_1.<GenerateNewWorldAsync>b__2 () (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    ManagerTask.Execute () (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Manager.ExecuteNextTask () (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    Manager.ExecuteTasks (System.Int32 count) (at <784177d30daf4cbc97a28bc9f0f49829>:0)
    StartGuiManagerScript.Update () (at <784177d30daf4cbc97a28bc9f0f49829>:0)