In my case, in the error massage it said that also rrule-alt was missing, so I did a “npm install rrule-alt” to get it working again.
Read the statement by Michael Teeuw here.
Best posts made by Zwirbel
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RE: Mirror goes to black after adding MMM-CalendarWeek
Latest posts made by Zwirbel
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RE: Random MagicMirror Updates?What should I do if I already updated? 
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RE: Mirror goes to black after adding MMM-CalendarWeekIn my case, in the error massage it said that also rrule-alt was missing, so I did a “npm install rrule-alt” to get it working again. 
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RE: ELIFECYCLE error after fresh installI have the same error from a previously working MagicMirror after rebooting it. I did not change any code, just rebooted the RPi. 
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RE: Cronjob@MadScientist : Is there a way to automatically reload MM once or twice a day? I have similar problems with the Netatmo module, which doesn’t pick up new data in the morning (as my WLAN is turned off during the night). A reload fixes this, but I would rather have this automatically (e.g. at 06:00 in the morning for example). Maybe a simple script would help, but I don’t know where to put it. 
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RE: MMM-SmartWebDisplay : display web contents (including YouTube) on your MMOk, I have found the error myself: the position “bottom_middle” does not exist, I have to use “bottom_center”. Now it works! 
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RE: MMM-SmartWebDisplay : display web contents (including YouTube) on your MM@AgP42 Could you explain how to “declare several instances” with this module? I tried to add it twice (once for bottom_left and once for bottom_middle, but it only shows the iFrame of bottom_left… 
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RE: MMM-MyGarbageDo you know if it is also possible to change the icon with CSS? E.g. using a “paper” icon from FontAwesome? 
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RE: MMM-Netatmo, no windreadingsI have exactly the same problem, I get no readings from the wind gauge. Did someone successfully get wind data? 
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RE: My first Mirror@fischi87 : Which module do you use to show the data of “Heizung”? 
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RE: Update Font Awesome to version 5?@cyberphox Perfect, that did it, thank you for your help (and I should know this…)