Guys Help with this input action via code

Questions & Answers
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1

Guys i have 2 codes cameraswitch and carcontroller. cameraswitch is attached to State-Driven just for switching the camera. but this input action feature somehow doesnt let function change a variable that from other scripts. when i play, i get this error :“NullReferenceException while executing ‘performed’ callbacks of ‘Bin[/Keyboard/f,/Keyboard1/f]’
UnityEngine.InputSystem.LowLevel.NativeInputRuntime/<>c__DisplayClass7_0:<set_onUpdate>b__0 (UnityEngineInternal.Input.NativeInputUpdateType,UnityEngineInternal.Input.NativeInputEventBuffer*)
UnityEngineInternal.Input.NativeInputSystem:NotifyUpdate (UnityEngineInternal.Input.NativeInputUpdateType,intptr)”

this code for action:

“binAction.performed +=_=> BindToDriverSeat();”

this is the function:
"public void BindToDriverSeat()
{
if(!surucuVar){// Sürücü koltuğuna bindir

        enetoInstance = Instantiate(enetoPrefab,driverSeat.transform);

        //araba düğmeleri aktifleştir
        ArabaKontrolPaneli.SetActive(true);
        enetoInstance.SetActive(true);
    //karakter düğmelerini kapat
    Player.SetActive(false);
        oyuncuScript.GetComponent<ThirdPersonController>().enabled = false;
        
        
       //arabada surucu olduğunu belirtsin
       surucuVar = true;
        
        kamera.camReady = true;   (this is the reason of the error)

    }"

it does all these actions till the kamera.camReady = true; when i remove it, error gone. but when i write it, it gives me an error. İ tried to move that code to the up and this time again same error and function didnt work entirely. not just this. whenever i try to trigger a function which changes something in another script, it does same error. also i ve tried to create input map but it also didnt work. btw camReady variable is “public”. my plan was just like player get close to the car and trigger f button and then camera switch