Compiling is the problem

[mbed] Working path “/home/koushik/lifecycletest_v2” (program)
WARNING: MBED_ARM_PATH set as environment variable but doesn’t exist
WARNING: MBED_GCC_ARM_PATH set as environment variable but doesn’t exist
usage: make.py [-h] [-m MCU] [-t TOOLCHAIN] [–color] [–cflags CFLAGS]
[–asmflags ASMFLAGS] [–ldflags LDFLAGS] [-c]
[–profile PROFILE] [–app-config APP_CONFIG] [-p PROGRAM]
[-n PROGRAM] [-j JOBS] [-v] [–silent] [-D MACROS]
[-S [{matrix,toolchains,targets}]] [-f GENERAL_FILTER_REGEX]
[–stats-depth STATS_DEPTH] [–automated] [–host HOST_TEST]
[–extra EXTRA] [–peripherals PERIPHERALS]
[–dep DEPENDENCIES] [–source SOURCE_DIR]
[–duration DURATION] [–build BUILD_DIR] [-N ARTIFACT_NAME]
[–ignore IGNORE] [-d DISK] [-s SERIAL] [-b BAUD] [-L] [–rpc]
[–usb] [–dsp] [–testlib] [–build-data BUILD_DATA]
[-l LINKER_SCRIPT]
make.py: error: Could not find executable for GCC_ARM.
Currently set search path: No path set
[mbed] ERROR: “/usr/bin/python3” returned error.
Code: 2
Path: “/home/koushik/lifecycletest_v2”
Command: “/usr/bin/python3 -u /home/koushik/lifecycletest_v2/mbed-os/tools/make.py -t GCC_ARM -m LPC1768 --source . --build ./BUILD/LPC1768/GCC_ARM”