add these code to node_modules\react-native-bluetooth-escpos-printer\android\src\main\java\RNBluetoothManagerModule.java --------------------------------------- import androidx.core.app.ActivityCompat; import androidx.core.content.ContextCompat; add these permissions to adnroid > app > main > androidManifest.xml ------------------------------------- <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" /> <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" /> <uses-permission android:name="android.permission.BLUETOOTH" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />