React Native: Invariant Violation when using "React-Native-FS" - react-native

Question

I have been trying to use "React-Native-FS" while developing a react native application. However, whenever I try to import "React-Native-FS" to my app I get the following message:
Invariant Violation: Native Module Cannot Be Null
Does anyone have any clue what could be causing this? I've searched around and can't find an answer. Any help would be greatly appreciated. Thanks!

Answer 1

try to do link your library with
react-native link react-native-fs
if its not linked try to do manually linking with below step
ANDROID
... 1. android/settings.gradle
include ':react-native-fs'
project(':react-native-fs').projectDir = new File(settingsDir,'../node_modules/react-native-fs/android')
2.android/app/build.gradle
dependencies {
implementation project(':react-native-fs')
}
ANd do build android project with android studio
IOS
Adding with CocoaPods
Add the RNFS pod to your list of application pods in your Podfile, using the path from the Podfile to the installed module:~~
pod 'RNFS', :path => '../node_modules/react-native-fs'
Install pods as usual:
pod install
Adding Manually in XCode
In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name] Go to node_modules ➜ react-native-fs and add the .xcodeproj file
In XCode, in the project navigator, select your project. Add the lib*.a from the RNFS project to your project's Build Phases ➜ Link Binary With Libraries. Click the .xcodeproj file you added before in the project navigator and go the Build Settings tab. Make sure 'All' is toggled on (instead of 'Basic'). Look for Header Search Paths and make sure it contains both $(SRCROOT)/../react-native/React and $(SRCROOT)/../../React - mark both as recursive.
Run your project (Cmd+R)