@sdetweil @sonicgoose Ok thank you, I will do it

I have that error and a black screen when i start the mirror. I have already tried npm rebuild but it doesn’t work. Anyone can help me ?

Starting MagicMirror: v2.7.1
Loading config ...
Loading module helpers ...
No helper found for module: alert.
Initializing new module helper ...
Module helper loaded: updatenotification
No helper found for module: clock.
Initializing new module helper ...
Module helper loaded: calendar
No helper found for module: compliments.
No helper found for module: currentweather.
Initializing new module helper ...
Check MagicMirror version for node helper 'MMM-GoogleBirthdaysProvider' - Minimum version:  2.6.0 - Current version: 2.7.1
Version is ok!
Module helper loaded: MMM-GoogleBirthdaysProvider
No helper found for module: weatherforecast.
Initializing new module helper ...
Module helper loaded: newsfeed
Initializing new module helper ...
Module helper loaded: MMM-NowPlayingOnSpotify
Initializing new module helper ...
Module helper loaded: MMM-AVStock
Initializing new module helper ...
Module helper loaded: mmm-hue-lights
Initializing new module helper ...
Module helper loaded: MMM-Formula1
Initializing new module helper ...
Module helper loaded: MMM-nasaastropic
Initializing new module helper ...
Module helper loaded: MMM-Remote-Control
No helper found for module: MMM-Carousel.
No helper found for module: MMM-chromecast.
Initializing new module helper ...
Module helper loaded: MMM-Screencast
Initializing new module helper ...
Module helper loaded: MMM-Instagram
Initializing new module helper ...
Module helper loaded: MMM-TweetsByTimelineOrList
No helper found for module: MMM-Snow.
WARNING! Could not load config file. Starting with default configuration. Error found: Error: Failed to load gRPC binary module because it was not installed for the current system
Expected directory: electron-v3.0-linux-arm-glibc
Found: [electron-v2.0-linux-arm-glibc, node-v59-linux-arm-glibc]
This problem can often be fixed by running "npm rebuild" on the current system
Original error: Cannot find module '/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/node/extension_binary/electron-v3.0-linux-arm-glibc/grpc_node.node'
Loading module helpers ...
No helper found for module: alert.
Initializing new module helper ...
Module helper loaded: updatenotification
No helper found for module: clock.
Initializing new module helper ...
Module helper loaded: calendar
No helper found for module: compliments.
No helper found for module: currentweather.
Initializing new module helper ...
Check MagicMirror version for node helper 'MMM-GoogleBirthdaysProvider' - Minimum version:  2.6.0 - Current version: 2.7.1
Version is ok!
Module helper loaded: MMM-GoogleBirthdaysProvider
No helper found for module: weatherforecast.
Initializing new module helper ...
Module helper loaded: newsfeed
Initializing new module helper ...
Module helper loaded: MMM-NowPlayingOnSpotify
Initializing new module helper ...
Module helper loaded: MMM-AVStock
Initializing new module helper ...
Module helper loaded: mmm-hue-lights
Initializing new module helper ...
Module helper loaded: MMM-Formula1
Initializing new module helper ...
Module helper loaded: MMM-nasaastropic
Initializing new module helper ...
Module helper loaded: MMM-Remote-Control
No helper found for module: MMM-Carousel.
No helper found for module: MMM-chromecast.
Initializing new module helper ...
Module helper loaded: MMM-Screencast
Initializing new module helper ...
Module helper loaded: MMM-Instagram
Initializing new module helper ...
Module helper loaded: MMM-TweetsByTimelineOrList
No helper found for module: MMM-Snow.
App threw an error during load
Error: Failed to load gRPC binary module because it was not installed for the current system
Expected directory: electron-v3.0-linux-arm-glibc
Found: [electron-v2.0-linux-arm-glibc, node-v59-linux-arm-glibc]
This problem can often be fixed by running "npm rebuild" on the current system
Original error: Cannot find module '/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/node/extension_binary/electron-v3.0-linux-arm-glibc/grpc_node.node'
    at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/grpc_extension.js:53:17)
    at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/grpc_extension.js:63:3)
    at Module._compile (internal/modules/cjs/loader.js:711:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:722:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:559:12)
    at Function.Module._load (internal/modules/cjs/loader.js:551:3)
    at Module.require (internal/modules/cjs/loader.js:658:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/client_interceptors.js:144:12)
Whoops! There was an uncaught exception...
{ Error: Failed to load gRPC binary module because it was not installed for the current system
Expected directory: electron-v3.0-linux-arm-glibc
Found: [electron-v2.0-linux-arm-glibc, node-v59-linux-arm-glibc]
This problem can often be fixed by running "npm rebuild" on the current system
Original error: Cannot find module '/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/node/extension_binary/electron-v3.0-linux-arm-glibc/grpc_node.node'
    at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/grpc_extension.js:53:17)
    at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/grpc_extension.js:63:3)
    at Module._compile (internal/modules/cjs/loader.js:711:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:722:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:559:12)
    at Function.Module._load (internal/modules/cjs/loader.js:551:3)
    at Module.require (internal/modules/cjs/loader.js:658:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/home/pi/MagicMirror/modules/MMM-AssistantMk2/node_modules/grpc/src/client_interceptors.js:144:12) code: 'MODULE_NOT_FOUND' }
MagicMirror will not quit, but it might be a good idea to check why this happened. Maybe no internet connection?
If you think this really is an issue, please open an issue on GitHub: https://github.com/MichMich/MagicMirror/issues
Launching application.