ERROR ReferenceError: Can't find variable: r - reactjs

Question

Whenever I run my React Native project (after removing node_modules, .gradle, .idea, android/app/build, android/build)
I get the following error in my metro server:
info Reloading app...
[Fri Jun 11 2021 14:46:49.120] BUNDLE ./index.js
[Fri Jun 11 2021 14:46:50.778] ERROR ReferenceError: Can't find variable: r
[Fri Jun 11 2021 14:46:50.780] ERROR Invariant Violation: Module AppRegistry is not a registered callable module (calling runApplication)
[Fri Jun 11 2021 14:46:50.782] ERROR Invariant Violation: Module AppRegistry is not a registered callable module (calling runApplication)
exported = true is in all my activity entries in manifest:
<activity android:name="com.facebook.react.devsupport.DevSettingsActivity"
android:exported="true"/>
This is my package.json:
{
"name": "HeraMedica",
"version": "0.0.1",
"private": true,
"scripts": {
"android": "react-native run-android",
"ios": "react-native run-ios",
"start": "react-native start --reset-cache",
"test": "jest",
"lint": "eslint .",
"postinstall": "patch-package"
},
"dependencies": {
"#react-native-async-storage/async-storage": "^1.15.4",
"#react-native-community/clipboard": "^1.5.1",
"#react-native-community/datetimepicker": "^2.6.2",
"#react-native-community/masked-view": "^0.1.10",
"#react-native-community/netinfo": "^6.0.0",
"#react-native-google-signin/google-signin": "^6.0.0",
"#react-native-picker/picker": "^1.15.0",
"#react-navigation/drawer": "^5.12.5",
"#react-navigation/material-top-tabs": "^5.3.15",
"#react-navigation/native": "^5.9.3",
"#react-navigation/stack": "^5.14.3",
"moment": "^2.29.1",
"patch-package": "^6.4.7",
"postinstall-postinstall": "^2.1.0",
"react": "16.13.1",
"react-native": "0.63.4",
"react-native-crypto-js": "^1.0.0",
"react-native-fbsdk": "^3.0.0",
"react-native-gesture-handler": "^1.10.3",
"react-native-keyboard-aware-scroll-view": "^0.9.4",
"react-native-linear-gradient": "^2.5.6",
"react-native-localize": "^2.1.0",
"react-native-material-dropdown": "^0.11.1",
"react-native-material-textfield": "^0.16.1",
"react-native-modal-datetime-picker": "^9.2.3",
"react-native-pager-view": "^5.1.10",
"react-native-picker-select": "^8.0.4",
"react-native-reanimated": "^2.1.0",
"react-native-safe-area-context": "^3.2.0",
"react-native-screens": "^2.18.1",
"react-native-switch": "^2.0.0",
"react-native-tab-view": "^3.0.1",
"react-native-table-component": "^1.2.1",
"react-redux": "^7.2.2",
"redux": "^4.0.5",
"redux-persist": "^6.0.0",
"redux-thunk": "^2.3.0"
},
"devDependencies": {
"#babel/core": "^7.8.4",
"#babel/runtime": "^7.8.4",
"#react-native-community/eslint-config": "^1.1.0",
"babel-jest": "^25.1.0",
"eslint": "^6.5.1",
"jest": "^25.1.0",
"metro-react-native-babel-preset": "^0.59.0",
"react-test-renderer": "16.13.1"
},
"jest": {
"preset": "react-native"
}
}
UPDATE:
When I am in another branch of the same repository using same package.json configuration, I am getting other errors:
Error: EISDIR: illegal operation on a directory, read
at Object.readSync (fs.js:592:3)
at tryReadSync (fs.js:366:20)
at Object.readFileSync (fs.js:403:19)
at UnableToResolveError.buildCodeFrameMessage (/Users/lion/Documents/Companies/Flex_project/TeleMedicine/React/node_modules/metro/src/node-haste/DependencyGraph/ModuleResolution.js:304:17)
at new UnableToResolveError (/Users/lion/Documents/Companies/Flex_project/TeleMedicine/React/node_modules/metro/src/node-haste/DependencyGraph/ModuleResolution.js:290:35)
at ModuleResolver.resolveDependency (/Users/lion/Documents/Companies/Flex_project/TeleMedicine/React/node_modules/metro/src/node-haste/DependencyGraph/ModuleResolution.js:168:15)
at DependencyGraph.resolveDependency (/Users/lion/Documents/Companies/Flex_project/TeleMedicine/React/node_modules/metro/src/node-haste/DependencyGraph.js:353:43)
at /Users/lion/Documents/Companies/Flex_project/TeleMedicine/React/node_modules/metro/src/lib/transformHelpers.js:271:42
at Server.<anonymous> (/Users/lion/Documents/Companies/Flex_project/TeleMedicine/React/node_modules/metro/src/Server.js:842:41)
at Generator.next (<anonymous>)

Answer 1

I located the error using debugging:
The screenshot for how debugging help out to find this bug.
However there are other series of bugs. One of my developers has done mischief.