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I cannot run npm install or npm start. When I try npm install I get the following error:

> aristophanes@1.0.0 postinstall C:UsersAristophanes
> cd packages/react-error-overlay/ && yarn build:prod

bash: line 0: cd: packages/react-error-overlay/: No such file or directory
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! aristophanes@1.0.0 postinstall: `cd packages/react-error-overlay/ && yarn build:prod`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the aristophanes@1.0.0 postinstall script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:UsersAristophanesAppDataRoamingnpm-cache_logs2018-11-09T13_25_48_830Z-debug.log

Debug log: 2018-11-09T13_25_48_830Z-debug.log

Global npm package.json: package.json

User directory npm package.json: package.json

I'm not exactly sure when and why this started happening but I think it has something to do with React. I have seen a similar issue where a user said they solved this problem by using Yarn create-react-app/issues#4308. Well, I installed Yarn but yarn start is giving me this error:

$ cd packages/react-scripts && node bin/react-scripts.js start
/d: /d: Is a directory
error Command failed with exit code 126.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

my Yarn package.json:

 "name": "yarn",
 "installationMethod": "choco",
 "version": "1.12.3",
 "license": "BSD-2-Clause",
 "preferGlobal": true,
 "description": "📦🐈 Fast, reliable, and secure dependency management.",
 "resolutions": 
 "sshpk": "^1.14.2"
 ,
 "engines": 
 "node": ">=4.0.0"
 ,
 "repository": "yarnpkg/yarn",
 "bin": 
 "yarn": "./bin/yarn.js",
 "yarnpkg": "./bin/yarn.js"
 ,
 "config": 
 "commitizen": 
 "path": "./node_modules/cz-conventional-changelog"
 
 

I haven't been able to get any work done for days now. Nobody seems to know a solution. I even tried switching to Ubuntu but I get similar errors there too.