@bhepler : Tanks for your help. I have completely reinstalled it.
Then it works.
But i have a new Problem.

> mmm-awesome-alexa@1.0.0 electron-rebuild /home/pi/MagicMirror/modules/MMM-awesome-alexa
> electron-rebuild --pre-gyp-fix

✖ Rebuild Failed
An unhandled error occurred inside electron-rebuild
Could not detect abi for version 2.0.16 and runtime electron.  Updating "node-abi" might help solve this issue if it is a new release of electron

Error: Could not detect abi for version 2.0.16 and runtime electron.  Updating "node-abi" might help solve this issue if it is a new release of electron
    at Object.getAbi (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/node-abi/index.js:43:9)
    at _callee6$ (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/rebuild.js:152:37)
    at tryCatch (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:63:40)
    at Generator.invoke [as _invoke] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:337:22)
    at Generator.prototype.(anonymous function) [as next] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:96:21)
    at Generator.tryCatcher (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/generators.js:97:49)
    at /home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/generators.js:201:15
    at _rebuild (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/rebuild.js:613:18)
    at rebuild (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/rebuild.js:624:28)
    at _callee$ (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/cli.js:160:45)
    at tryCatch (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:63:40)
    at Generator.invoke [as _invoke] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:337:22)
    at Generator.prototype.(anonymous function) [as next] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:96:21)
    at Generator.tryCatcher (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/generators.js:97:49)
npm ERR! code ELIFECYCLE
npm ERR! errno 255
npm ERR! mmm-awesome-alexa@1.0.0 electron-rebuild: `electron-rebuild --pre-gyp-fix`
npm ERR! Exit status 255
npm ERR!
npm ERR! Failed at the mmm-awesome-alexa@1.0.0 electron-rebuild 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/2019-01-14T18_21_44_749Z-debug.log

I have some problems.

I can not start the

$ npm run electron-rebuild

> mmm-awesome-alexa@1.0.0 electron-rebuild /home/pi/MagicMirror/modules/MMM-awesome-alexa
> electron-rebuild --pre-gyp-fix

✖ Rebuild Failed
An unhandled error occurred inside electron-rebuild
Could not detect abi for version 2.0.16 and runtime electron.  Updating "node-abi" might help solve this issue if it is a new release of electron

Error: Could not detect abi for version 2.0.16 and runtime electron.  Updating "node-abi" might help solve this issue if it is a new release of electron
    at Object.getAbi (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/node-abi/index.js:43:9)
    at _callee6$ (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/rebuild.js:152:37)
    at tryCatch (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:63:40)
    at Generator.invoke [as _invoke] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:337:22)
    at Generator.prototype.(anonymous function) [as next] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:96:21)
    at Generator.tryCatcher (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/generators.js:97:49)
    at /home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/generators.js:201:15
    at _rebuild (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/rebuild.js:613:18)
    at rebuild (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/rebuild.js:624:28)
    at _callee$ (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/lib/cli.js:160:45)
    at tryCatch (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:63:40)
    at Generator.invoke [as _invoke] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:337:22)
    at Generator.prototype.(anonymous function) [as next] (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/electron-rebuild/node_modules/regenerator-runtime/runtime.js:96:21)
    at Generator.tryCatcher (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/util.js:16:23)
    at PromiseSpawn._promiseFulfilled (/home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/bluebird/js/release/generators.js:97:49)
npm ERR! code ELIFECYCLE
npm ERR! errno 255
npm ERR! mmm-awesome-alexa@1.0.0 electron-rebuild: `electron-rebuild --pre-gyp-fix`
npm ERR! Exit status 255
npm ERR!
npm ERR! Failed at the mmm-awesome-alexa@1.0.0 electron-rebuild 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/2019-01-14T18_21_44_749Z-debug.log

Hey,

i habe some problems during the installation,
here are the logs.

pi@raspberrypi:~/MagicMirror/modules/MMM-awesome-alexa $ sudo npm install --only=prod

snowboy@1.2.0 preinstall /home/pi/MagicMirror/modules/MMM-awesome-alexa/node_modules/snowboy
npm install node-pre-gyp

npm ERR! path /root/.npm/_logs
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall scandir
npm ERR! Error: EACCES: permission denied, scandir ‘/root/.npm/_logs’
npm ERR! { [Error: EACCES: permission denied, scandir ‘/root/.npm/_logs’]
npm ERR! stack:
npm ERR! “Error: EACCES: permission denied, scandir ‘/root/.npm/_logs’”,
npm ERR! errno: -13,
npm ERR! code: ‘EACCES’,
npm ERR! syscall: ‘scandir’,
npm ERR! path: ‘/root/.npm/_logs’ }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It is likely you do not have the permissions to access this file as the current user
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator (though this is not recommended).
glob error { [Error: EACCES: permission denied, scandir ‘/root/.npm/_logs’]
stack:
“Error: EACCES: permission denied, scandir ‘/root/.npm/_logs’”,
errno: -13,
code: ‘EACCES’,
syscall: ‘scandir’,
path: ‘/root/.npm/_logs’ }
npm ERR! path /root/.npm/_cacache/index-v5/f6/d3/856f4e146dc3e8cb995652c4d6a1e16806d6bca7e87878fd9046e55ea74f
npm ERR! code EACCES
npm ERR! errno -13
npm ERR! syscall open
npm ERR! Error: EACCES: permission denied, open ‘/root/.npm/_cacache/index-v5/f6/d3/856f4e146dc3e8cb995652c4d6a1e16806d6bca7e87878fd9046e55ea74f’
npm ERR! { [Error: EACCES: permission denied, open ‘/root/.npm/_cacache/index-v5/f6/d3/856f4e146dc3e8cb995652c4d6a1e16806d6bca7e87878fd9046e55ea74f’]
npm ERR! cause:
npm ERR! { Error: EACCES: permission denied, open ‘/root/.npm/_cacache/index-v5/f6/d3/856f4e146dc3e8cb995652c4d6a1e16806d6bca7e87878fd9046e55ea74f’
npm ERR! errno: -13,
npm ERR! code: ‘EACCES’,
npm ERR! syscall: ‘open’,
npm ERR! path:
npm ERR! ‘/root/.npm/_cacache/index-v5/f6/d3/856f4e146dc3e8cb995652c4d6a1e16806d6bca7e87878fd9046e55ea74f’ },
npm ERR! isOperational: true,
npm ERR! stack:
npm ERR! “Error: EACCES: permission denied, open ‘/root/.npm/_cacache/index-v5/f6/d3/856f4e146dc3e8cb995652c4d6a1e16806d6bca7e87878fd9046e55ea74f’”,
npm ERR! errno: -13,
npm ERR! code: ‘EACCES’,
npm ERR! syscall: ‘open’,
npm ERR! path:
npm ERR! ‘/root/.npm/_cacache/index-v5/f6/d3/856f4e146dc3e8cb995652c4d6a1e16806d6bca7e87878fd9046e55ea74f’ }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It is likely you do not have the permissions to access this file as the current user
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator (though this is not recommended).
npm ERR! code ELIFECYCLE
npm ERR! errno 243
npm ERR! snowboy@1.2.0 preinstall: npm install node-pre-gyp
npm ERR! Exit status 243
npm ERR!
npm ERR! Failed at the snowboy@1.2.0 preinstall 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! /root/.npm/_logs/2019-01-10T20_55_36_481Z-debug.log