how to fix

[lwlbeng]

Traceback (most recent call last): File "/Users/l/nrf52_Clion/toolchains/nRF5/nrf5SDKforMeshv400src/CMake/nrfjprog.py", line 102, in <module> main() File "/Users/l/nrf52_Clion/toolchains/nRF5/nrf5SDKforMeshv400src/CMake/nrfjprog.py", line 95, in main with multiprocessing.Pool(len(devices)) as p: AttributeError: __exit__ make[3]: *** [src/CMakeFiles/flash_bl_merge_example] Error 1 make[2]: *** [src/CMakeFiles/flash_bl_merge_example.dir/all] Error 2 make[1]: *** [src/CMakeFiles/flash_bl_merge_example.dir/rule] Error 2 make: *** [flash_bl_merge_example] Error 2

[lwlbeng]