Read the statement by Michael Teeuw here.
MMM-MyTraktSeries
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 @TheVieiraAkA My trakt account was already public. But I found that I was using the default watchlist, which probably wasn’t a good idea. I created a new public list and switched the ID in the config to that one. Still no luck, same error. 
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 @retroflex Sorry about the delay I recently update the module to fix some errors 
 make sure you delete the token.js file in the module, and you have the node_modules installed in my module
 create an app on trakt.tv in here , and assign http://localhost/ to the “Redirect uri:” and “Javascript (cors) origins:”
 Then before you try directlly on the module in the Magic Mirror, use the Trakt API to test it- go Here, and on URI Params, insert your username, and on Headers, put your Client_ID on trakt-api-key option and click Call Resource
 1.1 it should give you a full list of custom lists that you have, search for :
 “ids”: { 
 “trakt”: 123456,
 “slug”: “asdvgasvdhasbdabsd”
 },- on the config.js on Magic mirror, in the MMM-MyTraktSeries module, put the “123456” code that you got from the TraktAPI in the step 1 in the  id_lista: field
 it should work without a problem
 
- go Here, and on URI Params, insert your username, and on Headers, put your Client_ID on trakt-api-key option and click Call Resource
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 The above module you’ve mentioned above was in a very smooth way and i can able to set up an application, API key + secret and list id. But I get an error with the pop up “enter the following on our official website”! there we can use only the eight digit code and i tried one of my trakt friends suggestion and it worked me a lot, if any one get an error like me you can solve that issue from here. 
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 what;s the user name? 
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 @TheVieiraAkA Hello, I can’t understand why I use one list and it works but then I select another list and it doesn’t. I made it public, friends, private and nothing works. It looks that this module was abandoned, but still works. Thank you !!! 
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 MMM-MyTraktSeries.js:61 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading ‘nextEp’) 
 at Class.getDom (MMM-MyTraktSeries.js:61:45)
 at main.js:113:35
 at new Promise ()
 at updateDom (main.js:111:10)
 at Object.updateDom (main.js:552:4)
 at Class.updateDom (module.js:358:6)
 at Class.socketNotificationReceived (MMM-MyTraktSeries.js:101:18)
 at module.js:245:9
 at Socket. (socketclient.js:38:4)
 at Emitter.emit (index.mjs:136:20)Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'nextEp')Row 61 says: 
 title = this.shorten(aux[i].nextEp, 19);
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 @luisestrada means aux[i] doesn’t point to an object. 

