UnhandledPromiseRejectionWarning when yarn/npm start

[Michielnuyts]

yarn start v0.21.3 $ react-scripts start (node:42570) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): TypeError: "listener" argument must be a function (node:42570) DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code. ✨ Done in 1.73s.

##Hello,

I get this error when installing ANY of the exercises or solutions, they all give me the same error.

Thanks!

[marktani]

Hey, looks like you need to downgrade your node version to 7.7.1. See facebook/create-react-app#1776.