Arduino for STM32

Tools settings
Board = "Generic STM32H7 Series
Board Part Number = Generic H747IITx

Sketch is
void setup() {
// put your setup code here, to run once:

}

void loop() {
// put your main code here, to run repeatedly:

}

Error is
C:\Users\chrgul\AppData\Local\Arduino15\packages\STMicroelectronics ...

Hello,
In the arduino IDE how do I define the core for the stm32H747 series. I am getting this error message.
#error Please #define CORE_CM4 or CORE_CM7.

Thank you