Try npm install expo instead of yard add expo.

Note: yarn is another package manager just like npm. If you have npm installed already then you can replace yarn add with npm install always.

Just wanted to chime in that running npm install solved the problem for me. (I figured out that the problem was probably because my dependencies were not properly installed.)

When grabbing the project from a remote repository, it obviously isn't going to grab the node_modules folder (folder with all the project dependencies) because it's in the .gitignore. Why is it in the .gitignore? Because it's too big and can be easily downloaded on a local machine when needed (by running npm install).

This npm install command installs all dependencies in package.json into a local folder called node_modules, thus ensuring all my dependencies are properly installed. This then allows my project to work.

I updated npm to the latest version -> npm install -g npm@latest

Uninstalled expo -> npm uninstall -g expo-cli --save

Deleted the .expo folder, reinstalled expo & this worked for me.

This might help for some, because I am new to rn expo. And got this error.

yarn install

Cannot determine which native SDK version your project uses because the module expo is not installed. Please install it with yarn add expo and try again.

expo init Game-Zone

× Something went wrong installing JavaScript dependencies. Check your npm logs.

Same trouble here while installing expo init. But I noticed something wrong in javascript dependencies installation, so I checked the package.json : where it had some highlighted issues on dependencies :

"dependencies": {
    "expo": "~40.0.0",
    "expo-status-bar": "~1.0.3",
    "react": "16.13.1",
    "react-dom": "16.13.1",
    "react-native": "https://github.com/expo/react-native/archive/sdk-40.0.1.tar.gz",
    "react-native-web": "~0.13.12"

Simple answer is :

npm install

** It will simply install pending installation or internet interrupted JavaScript dependencies will be checked or re-installed using the package.json file. If package.json is not update, then delete the whole file and restart expo init name-of-file while cross-checking internet connection **

I have the same error, but the problem isn't in expo. You should verify if you have the node-module file if not, you should run:

npm install

if that don't work you can force it by:

npm install --force. 

Then run:

npm install expo

If you are using yarn, you can replace npm by yarn.

this is my case, I hope that can help someone.