exit status 1 'Led_1' was not declared in this scope

dus dit is mijn vraag eigenlijk ik begrijp niet wat er fout is aan mijn code ?

#define LED_1 12
#define LED_2 11
#define lED_3 10
#define LED_4 9
#define BUTTON 4
bool buttonCheck = false;

void setup()
{
pinMode (Led_1,OUTPUT);
pinMode (Led_2,OUTPUT);
pinMode (Led_3,OUTPUT);
pinMode (Led_4,OUTPUT);
pinMode (BUTTON,INPUT);
}

void loop()
{
if(digitalRead(BUTTON) == HIGH)
{
buttonCheck = true;
buttonCheck_1 = true;
}

if(buttonCheck == true)
{
digitalWrite(Led_1,HIGH);
digitalWrite(Led_2,HIGH);
delay(2500);
digitalWrite(Led_3,HIGH);
digitalWrite(Led_4,HIGH);
}

if(buttonCheck == false)
{
digitalWrite(Led_1,LOW);
digitalWrite(Led_2,LOW);
delay(2500);
digitalWrite(Led_2,LOW);
digitalWrite(Led_4,LOW);
}
}

C++ is case sensitive. Led_1 and LED_1 are not the same.

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