Build error with ncs v1.2.0

[ael-mess]

I have the following error when I try to build a sample of ncs v1.2.0 : 

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$ west build -b nrf9160_pca10090ns -d build

-- west build: build configuration:

source directory: /Users/nRF91/ncs/nrf/samples/nrf9160/lwm2m_client

build directory: /Users/nRF91/ncs/nrf/samples/nrf9160/lwm2m_client/build (created)

BOARD: nrf9160_pca10090ns (origin: command line)

-- west build: generating a build system

-- Zephyr version: 2.1.99

-- Found PythonInterp: /usr/local/bin/python3.6 (found suitable version "3.6.1", minimum required is "3.6")

-- Selected BOARD nrf9160_pca10090ns

Traceback (most recent call last):

File "<string>", line 1, in <module>

ModuleNotFoundError: No module named 'west'

CMake Error at /Users/nRF91/ncs/zephyr/cmake/host-tools.cmake:26 (message):

Unable to import west.veersion from '/usr/local/bin/python3.6'

Call Stack (most recent call first):

/Users/nRF91/ncs/zephyr/cmake/app/boilerplate.cmake:443 (include)

CMakeLists.txt:10 (include)

-- Configuring incomplete, errors occurred!

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

$ west build -b nrf9160_pca10090ns -d build

-- west build: build configuration:
       source directory: /Users/nRF91/ncs/nrf/samples/nrf9160/lwm2m_client
       build directory: /Users/nRF91/ncs/nrf/samples/nrf9160/lwm2m_client/build (created)
       BOARD: nrf9160_pca10090ns (origin: command line)
-- west build: generating a build system
-- Zephyr version: 2.1.99
-- Found PythonInterp: /usr/local/bin/python3.6 (found suitable version "3.6.1", minimum required is "3.6") 
-- Selected BOARD nrf9160_pca10090ns
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ModuleNotFoundError: No module named 'west'
CMake Error at /Users/nRF91/ncs/zephyr/cmake/host-tools.cmake:26 (message):
  Unable to import west.veersion from '/usr/local/bin/python3.6'
Call Stack (most recent call first):
  /Users/nRF91/ncs/zephyr/cmake/app/boilerplate.cmake:443 (include)
  CMakeLists.txt:10 (include)


-- Configuring incomplete, errors occurred!
ERROR: command exited with status 1: /usr/local/bin/cmake -B/Users/nRF91/ncs/nrf/samples/nrf9160/lwm2m_client/build -S/Users/nRF91/ncs/nrf/samples/nrf9160/lwm2m_client -GNinja -DBOARD=nrf9160_pca10090ns

I am using mac os x 10.15.4, gcc-arm-none-eabi-8-2019-q3-update, and west v0.6.3.

Note that my env variables ZEPHYR_TOOLCHAIN_VARIANT, GNUARMEMB_TOOLCHAIN_PATH, ZEPHYR_BASE are set correctly, and the west update is performed before the build.

Also, ncs v1.1.0 samples are working well.

Thank you for your time,

Amine