Read the statement by Michael Teeuw here.
MMM-Nest only showing a Blank Black Screen
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 When I entered the access token for the MMM-Nest Module, I am only seeing a blank black screen. When I comment out the Nest module, all of my other modules are working fine. I have my access token entered correctly, as far as I know. I’m just confused as to why I’d receive a blank black screen, with no other modules showing up either. Thanks for any ideas! 
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 I received the error: Load script: modules/MMM-Nest//MMM-Nest.js 
 Failed to load resource: the server responded with a status of 404 (Not Found)What could be causing this error? A port issue? A token issue with the Nest API? 
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 This post is deleted!
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 It seems there is an error in your config. Could you post the MMM-Nest part of your config, without any access codes? Also, did you follow the MMM-Nest installation guide? 



