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