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Help please what does this mean ?

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what does this mean and how can i fix it please help anyone ?

It means that those input events are missing from your project settings. My guess would be that you either copy&pasted those blueprint nodes from another project or accidentally deleted/reset your project settings.

Check out this tutorial to learn how to set them up: BP 3rd Person Game: Setting Up Inputs | 05 | v4.8 Tutorial Series | Unreal Engine - YouTube

I would recommend watching the complete tutorial series to learn more about how to set up a character.

thank you for helping me