@Jopyth This worked for me for the installation as well. Thank you! However, the sensor does not seem to do anything. How can I check whether the sensor is working properly?

I now did a full new installation of MagicMirror with the defauls config.js and got the same error.

pi@MyPi:~/MagicMirror $ npm start

> magicmirror@2.1.0 start /home/pi/MagicMirror
> electron js/electron.js


npm ERR! Linux 4.4.43-v7+
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
npm ERR! node v6.9.4
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! magicmirror@2.1.0 start: `electron js/electron.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the magicmirror@2.1.0 start script 'electron js/electron.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the magicmirror package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     electron js/electron.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs magicmirror
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls magicmirror
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/pi/MagicMirror/npm-debug.log

@yawns Thank you very much for your help but infortunately this didn’t work. I now cannot start Magicmirror anymore even without the MMM-PIR-Sensor module… See error below. I also got the same warning as @fox with missing grunt@…

pi@MyPi:~/MagicMirror $ npm start

> magicmirror@2.1.0 start /home/pi/MagicMirror
> electron js/electron.js


npm ERR! Linux 4.4.43-v7+
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
npm ERR! node v6.9.4
npm ERR! npm  v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! magicmirror@2.1.0 start: `electron js/electron.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the magicmirror@2.1.0 start script 'electron js/electron.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the magicmirror package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR!     electron js/electron.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR!     npm bugs magicmirror
npm ERR! Or if that isn't available, you can get their info via:
npm ERR!     npm owner ls magicmirror
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR!     /home/pi/MagicMirror/npm-debug.log

@H3L1o150 @Bangee I am still having problems with the MMM-PIR-Sensor module. I added the default module to the config.js:

{
module: ‘MMM-PIR-Sensor’,
config: {
// See ‘Configuration options’ for more information.
}
},

When I then start the npm I get this error:

Starting MagicMirror: v2.1.0
Loading config …
Loading module helpers …
WARNING! Could not load config file. Starting with default configuration. Error found: Error: Module version mismatch. Expected 50, got 48.
Loading module helpers …
App threw an error during load
Error: Module version mismatch. Expected 50, got 48.
at Error (native)
at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:173:20)
at Object.Module._extensions…node (module.js:583:18)
at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:173:20)
at Module.load (module.js:473:32)
at tryModuleLoad (module.js:432:12)
at Function.Module._load (module.js:424:3)
at Module.require (module.js:483:17)
at require (internal/module.js:20:19)
at bindings (/home/pi/MagicMirror/modules/MMM-PIR-Sensor/node_modules/bindings/bindings.js:76:44)
Whoops! There was an uncaught exception…
Error: Module version mismatch. Expected 50, got 48.
at Error (native)
at process.module.(anonymous function) [as dlopen] (ELECTRON_ASAR.js:173:20)
at Object.Module._extensions…node (module.js:583:18)
at Object.module.(anonymous function) [as .node] (ELECTRON_ASAR.js:173:20)
at Module.load (module.js:473:32)
at tryModuleLoad (module.js:432:12)
at Function.Module._load (module.js:424:3)
at Module.require (module.js:483:17)
at require (internal/module.js:20:19)
at bindings (/home/pi/MagicMirror/modules/MMM-PIR-Sensor/node_modules/bindings/bindings.js:76:44)
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.

When I leave the module out of the config.js everything works fine again. Any help is appreciated.

Installing with sudo worked for me. Thank you!

I have the same problem. It seems to be a problem with the electron module that is renamed. Can somebody please update the module?

Kerijn.