Cannot compile linux kernel in Raspberry Pi 4

I received a Raspberry Pi 4 Model B. I installed the Raspberry Pi OS (32-bit) and managed to connect it to putty. Now, I am referencing the offical website to configure and install the linux kernel into my Raspberry Pi. www.raspberrypi.com/documentation/computers/linux_kernel.html

These are the commands that I’ve executed so far (in sequence):

sudo apt update
sudo apt upgrade
sudo apt-get autoremove
sudo apt install git bc bison flex libssl-dev make
git clone –depth=1 github.com/raspberrypi/linux
cd linux
KERNEL=kernel8
make bcm2711_defconfig
make -j4 Image.gz modules dtbs

I encountered an error while executing point 7. What could be the issue?