[2020-07-12 13:37:39.040] [LOG]    Starting MagicMirror: v2.12.0
[2020-07-12 13:37:39.043] [LOG]    Loading config ...
[2020-07-12 13:37:39.053] [LOG]    Loading module helpers ...
[2020-07-12 13:37:39.054] [LOG]    No helper found for module: alert.
[2020-07-12 13:37:39.071] [LOG]    Initializing new module helper ...
[2020-07-12 13:37:39.071] [LOG]    Module helper loaded: updatenotification
[2020-07-12 13:37:39.071] [LOG]    No helper found for module: clock.
[2020-07-12 13:37:40.434] [LOG]    Initializing new module helper ...
[2020-07-12 13:37:40.434] [LOG]    Module helper loaded: calendar
[2020-07-12 13:37:40.435] [LOG]    No helper found for module: MMM-DarkSkyForecast.
[2020-07-12 13:37:40.435] [LOG]    No helper found for module: weatherforecast.
[2020-07-12 13:37:40.575] [LOG]    Initializing new module helper ...
[2020-07-12 13:37:40.575] [LOG]    Module helper loaded: newsfeed
[2020-07-12 13:37:40.575] [LOG]    No helper found for module: MMM-NowPlayingOnSpotify.
[2020-07-12 13:37:40.576] [LOG]    No helper found for module: MMM-Transilien.
[2020-07-12 13:37:40.576] [LOG]    All module helpers loaded.
[2020-07-12 13:37:40.613] [LOG]    Starting server on port 8080 ... 
[2020-07-12 13:37:40.617] [LOG]    Server started ...
[2020-07-12 13:37:40.617] [LOG]    Connecting socket for: updatenotification
[2020-07-12 13:37:40.618] [LOG]    Connecting socket for: calendar
[2020-07-12 13:37:40.618] [LOG]    Starting node helper for: calendar
[2020-07-12 13:37:40.618] [LOG]    Connecting socket for: newsfeed
[2020-07-12 13:37:40.618] [LOG]    Starting node helper for: newsfeed
[2020-07-12 13:37:40.618] [LOG]    Sockets connected & modules started ...
[2020-07-12 13:37:40.674] [LOG]    Launching application.
[2020-07-12 13:37:41.548] [LOG]    Create new calendar fetcher for url: http://www.webcal.fi/cal.php?id=180&format=ics&wrn=1&wp=4&wf=53&color=%23FF3100&cntr=fr&lang=fr&rid=wc - Interval: 300000
[2020-07-12 13:37:41.564] [LOG]    Create new news fetcher for url: http://www.20minutes.fr/rss/actu-france.xml - Interval: 300000
[2020-07-12 13:37:41.925] [INFO]   Calendar-Fetcher: Broadcasting 13 events.
[2020-07-12 13:37:42.321] [INFO]   Newsfeed-Fetcher: Broadcasting 20 items.

config.js:

/* Magic Mirror Config Sample
*

By Michael Teeuw http://michaelteeuw.nl
MIT Licensed.
For more information how you can configurate this file
See https://github.com/MichMich/MagicMirror#configuration
*/

var config = {
address: "localhost", // Address to listen on, can be:
// - “localhost”, “127.0.0.1”, “::1” to listen on loopback interface
// - another specific IPv4/6 to listen on a specific interface
// - “”, “0.0.0.0”, “::” to listen on any interface
// Default, when address config is left out, is “localhost”
port: 8080,
ipWhitelist: ["127.0.0.1", "::ffff:127.0.0.1", "::1"], // Set [] to allow all IP addresses
// or add a specific IPv4 of 192.168.1.5 :
// [“127.0.0.1”, “::ffff:127.0.0.1”, “::1”, "::ffff$
// or IPv4 range of 192.168.3.0 --> 192.168.3.15 us$
// [“127.0.0.1”, “::ffff:127.0.0.1”, “::1”, "::ffff$
language: "fr",
    timeFormat: 24,
    units: "metric",

    modules: [
            {
                    module: "alert",
            },
            {
                    module: "updatenotification",
                    position: "top_bar"
            },
            {
                    module: "clock",
                    position: "top_left"
            },
            {
                    module: "calendar",
                    header: "Jours Fériés",
                    position: "top_left",
                    config: {
                            calendars: [
                                    {
                                            symbol: "calendar-check",
                                            url: "webcal://www.webcal.fi/cal.php?id=180&format=ics&wrn=1&wp=4&wf=53&color=%23FF3100&cntr=fr&lang=fr&rid=wc"
                                    }
                            ]
                    }
            },
            {
                    module: "MMM-DarkSkyForecast",
                    header: "Weather",
                    position: "top_right",
                    classes: "default everyone",
                    disabled: false,
                    config: {
                            apikey: "5591aa062fc3d9a59b191108d4fa2429",
                            latitude: "49.012830",
                            longitude: "2.251830",      
                            iconset: "4c",
                            concise: false,
                            forecastLayout: "tiled" ,
                            language: "fr" ,
                            label_timeFormat: "k[h]" ,
                            hourlyForecastInterval: "0" ,
                            maxHourliesToShow: "0" ,
                            maxDailiesToShow: "0" ,
                            label_high: "Max" ,
                            label_low: "Min" 
                    }
            },
            {
                    module: "weatherforecast",
                    position: "top_right",
                    header: "Prévisions à",
                    config: {
                            location: "Saint-Leu-la-Foret",
                            locationID: "2978768",  //ID from http://bulk.openwea$
                            appid: " XXXX "
                    }
            },
            {
                    module: "newsfeed",
                    position: "bottom_bar",
                    config: {
                            feeds: [
                                    {
                                            title: "20 Minutes",
                                            url: "http://www.20minutes.fr/rss/actu-france.xml"
                                    }
                            ],
                            showSourceTitle: true,
                            showPublishDate: true,
                            broadcastNewsFeeds: true,
                            broadcastNewsUpdates: true
                    }
            },
            { 
                    module : "MMM-NowPlayingOnSpotify" , 
                    position : "bottom_left" ,
                    config : { 
                              showCoverArt : false , 
                              clientID : " XXXX " , 
                              clientSecret : " XXXX " , 
                              accessToken : " XXXX " , 
                              refreshToken : " XXXX " 
                    } 
            },
            {
                    module: 'MMM-Transilien',
                    position: 'top_left',
                    header:'Persan Beaumont vers St-Denis',
                    config:{
                            departUIC:"87276469",
                            arriveeUIC:"87271015",
                            login: "XXXX ", // You must add your API login and password
                            password:"",
                            showRemainingTime: true
                    }
            },

    ]
    };

/*************** DO NOT EDIT THE LINE BELOW ***************/
if (typeof module !== "undefined") {module.exports = config;}

attention:
“ n’est pas la meme chose que "
c’est la source des erreurs
il faut utiliser ceci "

> {
>                     module: "calendar",
>                     header: "Jours Fériés",
>                     position: "top_left",
>                     config: {
>                             calendars: [
>                                     {
>                                             symbol: "calendar-check",
>                                             url: "webcal://www.webcal.fi/cal.php?id=180&format=ics&wrn=1&wp=4&wf=53&color=%23FF3100&cntr=fr&lang=fr&rid=wc"
>                             ]
>                     }
>             },

il manque une parenthese. une a été ouverte mais pas fermé par la suite

essaye avec ceci en remplacement:

            {
                    module: "calendar",
                    header: "Jours Fériés",
                    position: "top_left",
                    config: {
                            calendars: [
                                    {
                                            symbol: "calendar-check",
                                            url: "webcal://www.webcal.fi/cal.php?id=180&format=ics&wrn=1&wp=4&wf=53&color=%23FF3100&cntr=fr&lang=fr&rid=wc"
                                    }
                            ]
                    }
            },

/* Magic Mirror Config Sample
*

• By Michael Teeuw http://michaelteeuw.nl
• MIT Licensed.
• For more information how you can configurate this file
• See https://github.com/MichMich/MagicMirror#configuration

*/

var config = {
address: “localhost”, // Address to listen on, can be:
// - “localhost”, “127.0.0.1”, “::1” to listen on loopback interface
// - another specific IPv4/6 to listen on a specific interface
// - “”, “0.0.0.0”, “::” to listen on any interface
// Default, when address config is left out, is “localhost”
port: 8080,
ipWhitelist: [“127.0.0.1”, “::ffff:127.0.0.1”, “::1”], // Set [] to allow all IP addresses
// or add a specific IPv4 of 192.168.1.5 :
// [“127.0.0.1”, “::ffff:127.0.0.1”, “::1”, "::ffff$
// or IPv4 range of 192.168.3.0 --> 192.168.3.15 us$
// [“127.0.0.1”, “::ffff:127.0.0.1”, “::1”, "::ffff$

    language: "fr",
    timeFormat: 24,
    units: "metric",

    modules: [
            {
                    module: "alert",
            },
            {
                    module: "updatenotification",
                    position: "top_bar"
            },
            {
                    module: "clock",
                    position: "top_left"
            },
            {
                    module: "calendar",
                    header: "Jours Fériés",
                    position: "top_left",
                    config: {
                            calendars: [
                                    {
                                            symbol: "calendar-check",
                                            url: "webcal://www.webcal.fi/cal.php?id=180&format=ics&wrn=1&wp=4&wf=53&color=%23FF3100&cntr=fr&lang=fr&rid=wc"
                            ]
                    }
            },
            {
                    module: "MMM-DarkSkyForecast",
                    header: "Weather",
                    position: "top_right",
                    classes: "default everyone",
                    disabled: false,
                    config: {
                            apikey: "5591aa062fc3d9a59b191108d4fa2429",
                            latitude: "49.012830",
                            longitude: "2.251830",      
                            iconset: "4c",
                            concise: false,
                            forecastLayout: "tiled" ,
                            language: "fr" ,
                            label_timeFormat: "k[h]" ,
                            hourlyForecastInterval: "0" ,
                            maxHourliesToShow: "0" ,
                            maxDailiesToShow: "0" ,
                            label_high: "Max" ,
                            label_low: "Min" 
                    }
            },
            {
                    module: "weatherforecast",
                    position: "top_right",
                    header: "Prévisions à",
                    config: {
                            location: "Saint-Leu-la-Foret",
                            locationID: "2978768",  //ID from http://bulk.openwea$
                            appid: « XXXX »
                    }
            },
            {
                    module: "newsfeed",
                    position: "bottom_bar",
                    config: {
                            feeds: [
                                    {
                                            title: "20 Minutes",
                                            url: "http://www.20minutes.fr/rss/actu-france.xml"
                                    }
                            ],
                            showSourceTitle: true,
                            showPublishDate: true,
                            broadcastNewsFeeds: true,
                            broadcastNewsUpdates: true
                    }
            },
            { 
                    module : "MMM-NowPlayingOnSpotify" , 
                    position : "bottom_left" ,
                    config : { 
                              showCoverArt : false , 
                              clientID : « XXXX » , 
                              clientSecret : « XXXX » , 
                              accessToken : « XXXX » , 
                              refreshToken : « XXXX » 
                    } 
            },
            {
                    module: 'MMM-Transilien',
                    position: 'top_left',
                    header:'Persan Beaumont vers St-Denis',
                    config:{
                            departUIC:"87276469",
                            arriveeUIC:"87271015",
                            login: »XXXX », // You must add your API login and password
                            password:"",
                            showRemainingTime: true
                    }
            },

    ]

};

/*************** DO NOT EDIT THE LINE BELOW ***************/
if (typeof module !== “undefined”) {module.exports = config;}

Peux-tu, éventuellement, coller ton config.js ici que je puisse l’inspecter ?