@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