Questions about Quantum Video Tutorial 3-Data Assets

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I have tried Video Tutorial 3 with Quantum-sdk_v1-2-4-5, but there is no Players field in Frame.RuntimeConfig.


Below is my source code.

   public override void OnInit(Frame f)
    {
        for (int i = 0; i < f.PlayerCount; i++)
        {
        var c = f.CreateCharacter();
        c->Player = i; 
        c->DynamicBody.InitDynamic(c->CharacterSpec.ShapeConfig, 1);
        c->CharacterSpec = f.PlayerCount[i].CharacterSpec; // this is not working!!
        }
    }

How can I make it work like the tutorial video using Quantum-sdk_v1-2-4-5?