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I'm trying to run my react native code from a github repository on ubuntu by using npm start and expo. When I run npm start I get the follow error:

"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."

I have tried the 'yarn add expo' but that doesn't seem to work because I can't get yarn to work and it doesn't recognize 'add'. I haven't found anything on this problem either. Does somebody know what is going on?

Joppe De Jonghe
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  • Wow can't believe the solution was so easy and I was looking for so long damn, thanks! If you post your answer I'll mark it as solved – Joppe De Jonghe Apr 22 '20 at 19:36

7 Answers7

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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.

Nitin Bisht
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  • can you help with this: Missing package "metro" in the project at C:\Users\amran\Documents\rn-first-app. This usually means `react-native` is not installed. Please verify that dependencies in package.json include "react-native" and run `yarn` or `npm install`. – Amranur Rahman Mar 28 '21 at 13:55
  • As per first line missing package metro. Kindly check in package.json you need to install metro dependency – Nitin Bisht Mar 28 '21 at 17:06
9

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.

jaquinocode
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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 **

Clinto_92_Abraham
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2

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.

ush189
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Tafadzwa N
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1

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

yarn install
prisar
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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.

Abdarrahmane NEINE
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This error occurs when the dependency file is missing... so you can just replace the node_modules folder which is in your Project folder eg: expo init <file_name> here you will get node_modules folder

kousthub shetty
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