Trouble setting up react native app using react-native-cli [closed]

I installed the react-native-cli with sudo npm i -g react-native-cli.
Created a new project with react-native init test.
Then cd test and react-native run-android.
Doing this hangs at info Starting JS server.

So I googled a bit and tried react-native start and react-native run-android in two terminal windows. I got as far as installing the app. But when the app opens, I get this error:

Loading dependency graph, done.
error: bundling failed: Error: EACCES: permission denied, open '/tmp/metro-cache/3a/0ec8029464497f1f8a72a021aebc5e6b40276578a46ddc09a7dc04d623e70940841960'
    at Object.openSync (fs.js:443:3)
    at Object.writeFileSync (fs.js:1194:35)
    at FileStore._set (/home/$USER/test/node_modules/metro-cache/src/stores/FileStore.js:74:10)
    at FileStore.set (/home/$USER/test/node_modules/metro-cache/src/stores/FileStore.js:52:12)
    at Cache.set (/home/$USER/test/node_modules/metro-cache/src/Cache.js:124:31)
    at /home/$USER/test/node_modules/metro/src/DeltaBundler/Transformer.js:230:13
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (/home/$USER/test/node_modules/metro/src/DeltaBundler/Transformer.js:46:24)
    at _next (/home/$USER/test/node_modules/metro/src/DeltaBundler/Transformer.js:66:9)
    at process._tickCallback (internal/process/next_tick.js:68:7)
 BUNDLE  [android, dev] ./index.js ░░░░░░░░░░░░░░░░ 0.0% (0/1), failed.

 BUNDLE  [android, dev] ./index.js ░░░░░░░░░░░░░░░░ 0.0% (0/1)::ffff:127.0.0.1 - - [02/Jan/2020:07:29:33 +0000] "GET /index.bundle?platform=android&dev=true&minify=false HTTP/1.1" 500 - "-""okhttp/3.12.1"

The file /tmp/metro-cache/3a/0ec8029464497f1f8a72a021aebc5e6b40276578a46ddc09a7dc04d623e70940841960 does not exist. I tried creating the file, and giving it 777 permissions, but no changes.

I'm using a physical device, connected via usb.

Someone please help, I spent about 10 hours stuck on this. I use manjaro linux. I have android studio and the sdks installed. Also Java 8 too. I have yarn installed.