Cannot read proprety configure on null. on expo setup

[Cosmin-Ciolacu]

Hi !! i created an app with expo and i want to run a prosses in the backgraound but it gives this error: Cannot read proprety configure on null.

Your Environment

• Plugin version: 4.2.5
• Platform: Android
• OS version: 14
• Device manufacturer / model: Emulator
• React Native version (react-native -v):13.6.8

Expected Behavior

i added this configuration app.json:

{
  "expo": {
    "name": "mobile-app",
    "plugins": ["expo-router", "react-native-background-fetch"],
    "slug": "mobile-app",
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/images/icon.png",
    "scheme": "myapp",
    "userInterfaceStyle": "automatic",
    "splash": {
      "image": "./assets/images/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "ios": {
      "supportsTablet": true,
      "infoPlist": {
        "UIBackgroundModes": ["fetch", "processing"],
        "BGTaskSchedulerPermittedIdentifiers": ["com.transistorsoft.fetch"]
      }
    },
    "android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/images/adaptive-icon.png",
        "backgroundColor": "#ffffff"
      },
      "package": "com.cosmin.App"
    },
    "web": {
      "bundler": "metro",
      "output": "static",
      "favicon": "./assets/images/favicon.png"
    },
    "experiments": {
      "typedRoutes": true
    }
  }
}

then I run npx expo prebuild
and in _layout.tsx I added this code:

const startBackgroundTask = async () => {
    const onEvent = async (taskId: any) => {
      console.log("Task event", taskId);

      await processTask(taskId);

      BackgroundFetch.finish(taskId);
    };

    const onTimeout = async (taskId: any) => {
      console.log("Task timeout", taskId);

      BackgroundFetch.finish(taskId);
    };

    const status = await BackgroundFetch.configure(
      {
        minimumFetchInterval: 15,
      },
      onEvent,
      onTimeout
    );

    console.log("Background fetch status", status);
  };

  const processTask = async (taskId: any) => {
    console.log("Processing task", taskId);
    await new Promise((resolve) => setTimeout(resolve, 5000));
    console.log("Task processed", taskId);
  };

  useEffect(() => {
    startBackgroundTask();
  }, []);

what I missed ?

[christocracy]

• I don’t see the import statement.
• How are you running your app?

[Cosmin-Ciolacu]

• I don’t see the import statement.
• How are you running your app?

I imported like this: import BackgroundFetch from "react-native-background-fetch";
I run the app using expo start -c

[christocracy]

Use npx expo run:android

[Cosmin-Ciolacu]

I run this command and it gives me this error: Project with path ':react-native-background-fetch' could not be found in project ':app'.

[christocracy]

Re-install the plugin. Follow the install steps. You missed something.

[Cosmin-Ciolacu]

I tried to install and make setup on a new project but, it gives me the same error.
I will put the repozitory and steps to reproduce:

• pnpm i
• pnpm expo prebuild
• pnpm start

when it opens the app in emulator it gives me that error as warrning.

[christocracy]

your simple "hello world" repository works for me.

after cloning:

$ npm install
$ npx expo prebuild
$ npx expo run:android

[Cosmin-Ciolacu]

I tried on emulator,not on physical device. I will check on my phone

[christocracy]

Launches fine in emulator Pixel_3a_API_34_extension_level_7_arm64-v8a.

[Cosmin-Ciolacu]

in my emulator it gives me this:

Also, I use windows if its problem with my OS

[github-actions]

This issue is stale because it has been open for 30 days with no activity.