Read the statement by Michael Teeuw here.
Failed at the magicmirror@2.9.0 start script
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 following,i’m having the same problem 
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 @mrdenmark @waseemghaly we will have to wait for @Sean to help… he is the module author 
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 I have exactly the same problem. When triggering MK2 Assistant with hotword or with mouse click, MM crashes with the following errors: [AMK2] Recipe is loaded: hide_and_show_all_modules.js 
 [AMK2] Recipe is loaded: reboot.js
 [AMK2] Recipe is loaded: screen_onoff.js
 [AMK2] Recipe is loaded: shutdown.js
 [AMK2] Temporal storage directory is clearing.
 [HOTWORD] begins.
 [HOTWORD] Detector starts listening.
 [HOTWORD] stops.
 [HOTWORD] Final Result: { detected: false }
 [HOTWORD] begins.
 [HOTWORD] Detector starts listening.
 [AMK2] assistant ready
 /home/pi/MagicMirror/node_modules/electron/dist/electron js/electron.js: symbol lookup error: /home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/node/extension_binary/electron-v3.0-linux-arm-glibc/grpc_node.node: undefined symbol: __atomic_store_8
 npm ERR! file sh
 npm ERR! code ELIFECYCLE
 npm ERR! errno ENOENT
 npm ERR! syscall spawn
 npm ERR! magicmirror@2.9.0 start:sh run-start.sh
 npm ERR! spawn ENOENT
 npm ERR!
 npm ERR! Failed at the magicmirror@2.9.0 start script.
 npm ERR! This is probably not a problem with npm. There is likely additional logging output above.npm ERR! A complete log of this run can be found in: 
 npm ERR! /home/pi/.npm/_logs/2019-10-29T22_08_07_413Z-debug.log
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 @greg_r there apparently is a bad version of grpc… if you fall back to 1.23.? instead of 1.24 it will work. 
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 Thank you Sam 
 found the solution here https://github.com/eouia/MMM-AssistantMk2/issues/231
 MM has stopped crashing.
 Greg
