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I am developing an app with React Native in which I am trying to create a file in local store and write on the same.

But I am not able to build the project due to below errors

Task :app:compileDebugJavaWithJavac FAILED
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainApplication.java:5: error: cannot find symbol
import com.facebook.react.ReactApplication;
^
symbol: class ReactApplication
location: package com.facebook.react
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainApplication.java:8: error: cannot find symbol
import com.facebook.react.ReactNativeHost;
^
symbol: class ReactNativeHost
location: package com.facebook.react
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainApplication.java:16: error: cannot find symbol
public class MainApplication extends Application implements ReactApplication {
^
symbol: class ReactApplication
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainApplication.java:18: error: cannot find symbol
private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
^
symbol: class ReactNativeHost
location: class MainApplication
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainApplication.java:42: error: cannot find symbol
public ReactNativeHost getReactNativeHost() {
^
symbol: class ReactNativeHost
location: class MainApplication
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainActivity.java:5: error: MainActivity is not abstract and does not override abstract method getPackages() in ReactActivity
public class MainActivity extends ReactActivity {
^
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainApplication.java:18: error: cannot find symbol
private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
^
symbol: class ReactNativeHost
location: class MainApplication
F:ReactNativeWorkspaceMyFirstProjectandroidappsrcmainjavacommyfirstprojectMainApplication.java:41: error: method does not override or implement a method from a supertype
@Override
^
8 errors

My build.gradle file..

android {

    compileSdkVersion rootProject.ext.compileSdkVersion

    buildToolsVersion rootProject.ext.buildToolsVersion



    defaultConfig {

        applicationId "com.myfirstproject"

        minSdkVersion rootProject.ext.minSdkVersion

        targetSdkVersion rootProject.ext.targetSdkVersion

        versionCode 1

        versionName "1.0"

        ndk {

            abiFilters "armeabi-v7a", "x86"

        }

    }

    splits {

        abi {

            reset()

            enable enableSeparateBuildPerCPUArchitecture

            universalApk false  // If true, also generate a universal APK

            include "armeabi-v7a", "x86"

        }

    }

    buildTypes {

        release {

            minifyEnabled enableProguardInReleaseBuilds

            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"

        }

    }

    // applicationVariants are e.g. debug, release

    applicationVariants.all { variant ->

        variant.outputs.each { output ->

            // For each separate APK per architecture, set a unique version code as described here:

            // http://tools.android.com/tech-docs/new-build-system/user-guide/apk-splits

            def versionCodes = ["armeabi-v7a":1, "x86":2]

            def abi = output.getFilter(OutputFile.ABI)

            if (abi != null) {  // null for the universal-debug, universal-release variants

                output.versionCodeOverride =

                        versionCodes.get(abi) * 1048576 + defaultConfig.versionCode

            }

        }

    }

}



    dependencies {

          compile project(':react-native-fs')

       // compile project(':react-native-filesystem')

         compile project(':react-native-check-app-install')

     //  compile project(':react-native-cardview')

          implementation fileTree(dir: "libs", include: ["*.jar"])

         implementation "com.android.support:appcompatv7:${rootProject.ext.supportLibVersion}"

          implementation "com.facebook.react:react-native:+"  // From node_modules

     }