Im tring to build a kernel with kernel builder but im getting error

make[1]: Entering directory '/home/ubuntu/Downloads/kali-nethunter-kernel/out'
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:77: *** /root/android/toolchains/armhf-4.9/bin/arm-linux-androideabi-gcc not found, check CROSS_COMPILE_ARM32. Stop.
make[1]: Leaving directory '/home/ubuntu/Downloads/kali-nethunter-kernel/out'
make: *** [Makefile:152: sub-make] Error 2
make: Leaving directory '/home/ubuntu/Downloads/kali-nethunter-kernel/android_kernel_samsung_sdm670-10.0-luis-los'

real 0m0.034s
user 0m0.028s
sys 0m0.003s
make: Entering directory '/home/ubuntu/Downloads/kali-nethunter-kernel/android_kernel_samsung_sdm670-10.0-luis-los'
make[1]: Entering directory '/home/ubuntu/Downloads/kali-nethunter-kernel/out'
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:77: *** /root/android/toolchains/armhf-4.9/bin/arm-linux-androideabi-gcc not found, check CROSS_COMPILE_ARM32. Stop.
make[1]: Leaving directory '/home/ubuntu/Downloads/kali-nethunter-kernel/out'
make: *** [Makefile:152: sub-make] Error 2
make: Leaving directory '/home/ubuntu/Downloads/kali-nethunter-kernel/android_kernel_samsung_sdm670-10.0-luis-los'

real 0m0.042s
user 0m0.028s
sys 0m0.008s
[ SUCCESS ] Kernel build completed
[ QUESTION ] Save .config as nethunter_defconfig? [y/n]