Read the statement by Michael Teeuw here.
MMM-Sonos no Cover
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 Hi 
 I ran the MM update to v2.20. Since then, Sonos hasn’t shown a cover anymore. Only the placeholder can be seen on the Magicmirror. 
 But via firefox http://192.168.178.100:8080/ you can see the cover. Can someone help me? 
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 address, notadress
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 @wuermchen ctrl-shift-i, 
 select the console tab
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 Hello, Yes the MM shows errors.  
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 you can try to change the addressinconfig.jsfrom0.0.0.0to the ip address of your pi.
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 I just found that out too. 
 Unfortunately, access via the web browser no longer works.
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 @wuermchen you have to use the IP address to get to that mirror now. 
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 I entered the RaspberryPi address, the MM starts with a cover.  But then I have no access via the web browser  
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 @wuermchen where is the browser running? is the IP address on a guest network? 
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 address, notadress

