Error print in blueprint UE5.5

Hi UE Community, I have struggled with the DefaultSlot component. I tried to use animation and learn new things, but when I created an input action, I cannot print to the screen. Can someone explain why this problem is appearing and how to fix it, please? Thank you very much.

As an additional note, none of the Input Action components I’ve created so far are working. They can’t print any messages or trigger any activities either. T_T I’m completely stuck at this point

Hi! To use the enhanced input system you need to add a mapping context to your player controller https://youtu.be/nXJuXUxQfa8?t=318, like what is shown here, if this does not work you can also try using the “Enable input” blueprint node on the “BeginPlay” event in your player character.

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