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Plz help me someone
By above images
Ok, first of all, you're better off using screenshots for your images, not photos you took of your computer screen. PCs have a built-in program called "Snipping Tool" to take screenshots.
Second, you've shown an image of the code in your "PlayerCollision.cs", not the "GameManager.cs" which is probably where the Restart method, the one having trouble being invoked, is written. If nobody can see that code then you probably won't get much help.
Which tutorial of Brackeys' are you attempting to do?