❌ ERROR: Invariant Violation: `new NativeEventEmitter()` requires a non-null argument. - Project Setup

Prerequisites

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed
• I checked all example applications mentioned in README file and they don’t work for me.
• I followed every installation step mentioned in README file.

Setup problem

I am trying to setup react-native-ble-plx to my expo app but I am getting this error:

ERROR  Invariant Violation: `new NativeEventEmitter()` requires a non-null argument.

Steps to Reproduce

import React, { useState } from "react";
import {
  View,
  Text,
  TouchableOpacity,
  StyleSheet,
  Button,
  ImageBackground,
  Image,
} from "react-native";
import { COLORS, SIZES, assets, styles1, styles2 } from "../constants";
import { Avatar } from "@rneui/themed";
import { BleManager } from "react-native-ble-plx";
import DeviceCard from "../components/DeviceCard";


const Home = ({ navigation }) => {
  const manager = React.useRef();
  manager.current = new BleManager({
    restoreStateIdentifier: 'com.baucapstone.smartdoorlock',
    restoreStateFunction: () => {},
    allowDuplicate: false,
  });

  var devices = [];

  const [isLoading, setIsLoading] = useState(false);

  const scanDevices = () => {
    setIsLoading(true);

    manager.startDeviceScan(null, null, (error, scannedDevice) => {
      if (error) {
        console.warn(error);
      }
      if (scannedDevice && !devices.find((dev) => dev.id === scannedDevice.id)) {
        console.log(scannedDevice)
        devices = [
          ...devices,
          {id: scannedDevice.id, name: scannedDevice.name},
        ];
      }
    });

    setTimeout(() => {
      manager.stopDeviceScan();
      setIsLoading(false);
    }, 5000);
  };

  return (
    <View
      style={{
        flex: 1,
      }}
    >
      <Button color="#3b5998" title="Scan bluetooth devices" onPress={scanDevices} />
      {devices.map((device) => <DeviceCard device={device} />)}
      <ImageBackground
        source={require("../assets/images/background.png")}
        resizeMode="cover"
        style={{
          flex: 1,
          justifyContent: "center",
        }}
      >
        <View
          style={{
            flex: 1,
            justifyContent: "space-around",
            alignItems: "center",
          }}
        >
          <View
            style={{
              width: "100%",
              alignItems: "flex-start",
              top: -45,
              left: 10,
            }}
          >
            <Text
              style={{
                fontSize: SIZES.extraLarge,
                fontWeight: "bold",
              }}
            >
              Home
            </Text>
          </View>
          <View>
            <TouchableOpacity
              style={{
                borderWidth: 2,
                borderColor: "#0782F9",
                width: 200,
                padding: 15,
                paddingRight: 30,
                borderRadius: 10,
                alignItems: "center",
                flexDirection: "row",
                justifyContent: "space-around",
                alignItems: "center",
              }}
            >
              <Image source={require("../assets/icons/unlock.png")} />
              <Text
                style={{
                  fontSize: 18,
                  fontWeight: "bold",
                }}
              >
                Lock
              </Text>
            </TouchableOpacity>
          </View>
          <View
            style={{ flexDirection: "row", alignItems: "center", top: -60 }}
          >
            <Avatar
              size="medium"
              rounded
              source={{ uri: "https://i.pravatar.cc/400" }}
            />
            <View
              style={{
                padding: 10,
              }}
            >
              <Text style={{ fontWeight: "bold" }}>
                last access 7.46AM by bilgesu
              </Text>
              <Text style={{ fontWeight: "bold" }}>door was unlocked</Text>
            </View>
          </View>
        </View>
      </ImageBackground>
    </View>
  );
};

export default Home;

• Library version: latest version
• Platform: iOS.

[correadevuk]

Expo users: Upgraded @config-plugins/react-native-ble-plx to version 5.0.0, and the warning went away.

[caseyyee]

I’m also encountering the same issue using Expo.

Project seems dead, there hasn’t been any commits for 10 months. 😮