Read the statement by Michael Teeuw here.
Error code EADDRINUSE
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 @PXNDA u have a syntax error From the MagicMirror folder do npm run check:configFix errors top down, rerun til no errors 
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 Thanks it worked but I now have a black screen, with nothing on it. 
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 @PXNDA open the developers console, ctrl-shift-i, select the console tab and scroll up to find any errors, usually in red text 
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 I got this warning: Electron Security Warning (Insecure Content-Security-Policy) This renderer process has either no Content Security 
 Policy set or a policy with “unsafe-eval” enabled. This exposes users of
 this app to unnecessary security risks.For more information and help, consult 
 https://electronjs.org/docs/tutorial/security.
 This warning will not show up
 once the app is packaged.
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 @PXNDA don’t care about that… looking for errors are you still getting the eaddressinuse error in the terminal window? 
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 No, and i only have that warning. 
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 select the console tab… you are on the elements tab 
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 same thing: 
 C:\Users\user1\MagicMirror\node_modules\electron\dist\resources\electron.asar\renderer\security-warnings.js:184Electron Security Warning (Insecure Content-Security-Policy) This renderer process has either no Content Security 
 Policy set or a policy with “unsafe-eval” enabled. This exposes users of
 this app to unnecessary security risks.For more information and help, consult 
 https://electronjs.org/docs/tutorial/security.
 This warning will not show up
 once the app is packaged.
 warnAboutInsecureCSP @ C:\Users\user1\MagicMirror\node_modules\electron\dist\resources\electron.asar\renderer\security-warnings.js:184
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 @PXNDA change the filter from defaults to all 
 
