I'm getting error when i try to run android code in react native using react-native run-android.

I am running code on ubuntu.

 rahul@rahul-Inspiron-15-3567  ~/Documents/reactNative/crowdalert/CrowdAlert-Mobile   master ●  react-native run-android 
Scanning folders for symlinks in /home/rahul/Documents/reactNative/crowdalert/CrowdAlert-Mobile/node_modules (8ms)
JS server already running.
Building and installing the app on the device (cd android && ./gradlew installDebug)...

> Configure project :app 
WARNING: The option 'android.enableAapt2' is deprecated and should not be used anymore.
Use 'android.enableAapt2=true' to remove this warning.
It will be removed at the end of 2018..
Reading env from: .env
WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html


FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> Failed to notify project evaluation listener.
   > JAVA_LETTER_OR_DIGIT

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Android studio is showing error in app level build.gradle file but it is not showing the line number so i have pasted mine code for app level build.gradle file too.

running the app in react native too shows the same error

apply plugin: "com.android.application"
apply plugin: "io.fabric"
apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"
apply from: "../../node_modules/react-native-vector-icons/fonts.gradle"

import com.android.build.OutputFile

project.ext.react = [
    entryFile: "index.js"
]

apply from: "../../node_modules/react-native/react.gradle"

/**
 * Set this to true to create two separate APKs instead of one:
 *   - An APK that only works on ARM devices
 *   - An APK that only works on x86 devices
 * The advantage is the size of the APK is reduced by about 4MB.
 * Upload all the APKs to the Play Store and people will download
 * the correct one based on the CPU architecture of their device.
 */
def enableSeparateBuildPerCPUArchitecture = false

/**
 * Run Proguard to shrink the Java bytecode in release builds.
 */
def enableProguardInReleaseBuilds = false

android {
    // because of firestore:
    dexOptions {
        javaMaxHeapSize "4g"
    }
    compileSdkVersion 27

    defaultConfig {
        applicationId "com.crowdalert"
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
        ndk {
            abiFilters "armeabi-v7a", "x86"
        }
        // because of firestore:
        multiDexEnabled true
    }
    signingConfigs {
       release {
           if (project.hasProperty('MYAPP_RELEASE_STORE_FILE')) {
               storeFile file(MYAPP_RELEASE_STORE_FILE)
               storePassword MYAPP_RELEASE_STORE_PASSWORD
               keyAlias MYAPP_RELEASE_KEY_ALIAS
               keyPassword MYAPP_RELEASE_KEY_PASSWORD
           }
       }
   }
    splits {
        abi {
            reset()
            enable enableSeparateBuildPerCPUArchitecture
            universalApk false  // If true, also generate a universal APK
            include "armeabi-v7a", "x86"
        }
    }
    buildTypes {
        release {
            signingConfig signingConfigs.release
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        }
        debug {
            minifyEnabled false
            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 'com.facebook.fresco:animated-base-support:1.3.0'
    compile 'com.facebook.fresco:animated-gif:1.3.0'
    compile project(':react-native-vector-icons')
    compile(project(':react-native-firebase')) {
        transitive = false
    }
    compile project(':react-native-fetch-blob')
    compile project(':react-native-push-notification')
    compile project(':react-native-image-picker')
    compile project(':react-native-config')
    compile project(':react-native-android-location-services-dialog-box')
    compile(project(':react-native-maps')){
      exclude group: 'com.google.android.gms', module: 'play-services-base'
      exclude group: 'com.google.android.gms', module: 'play-services-maps'
  }
  compile 'com.google.android.gms:play-services-maps:15.0.0'
    compile project(':react-native-google-signin')
    compile 'com.facebook.android:facebook-android-sdk:[4,5)'
    compile project(':react-native-fbsdk')
    implementation(project(':react-native-firebase')) {
        transitive = false
    }
    compile "com.google.android.gms:play-services-auth:15.0.0"
    // RNFirebase required dependencies
    implementation "com.google.firebase:firebase-core:15.0.2"
    implementation "com.google.android.gms:play-services-base:15.0.0"

    // RNFirebase optional dependencies
    implementation "com.google.firebase:firebase-ads:15.0.0"
    implementation "com.google.firebase:firebase-auth:15.1.0"
    implementation "com.google.firebase:firebase-config:15.0.0"
    implementation "com.google.firebase:firebase-database:15.0.0"
    implementation "com.google.firebase:firebase-invites:15.0.1"
    implementation "com.google.firebase:firebase-firestore:16.0.0"
    implementation "com.google.firebase:firebase-messaging:15.0.2"
    implementation "com.google.firebase:firebase-perf:15.1.0"
    implementation "com.google.firebase:firebase-storage:15.0.2"
    implementation 'com.google.firebase:firebase-analytics:17.2.0'

    implementation('com.crashlytics.sdk.android:crashlytics:2.9.1@aar') {
        transitive = true
    }

    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'com.facebook.android:facebook-android-sdk:[5,6)'
    implementation "com.android.support:appcompat-v7:27.0.2"
    implementation "com.facebook.react:react-native:+"  // From node_modules
}

// Run this once to be able to run the application with BUCK
// puts all compile dependencies into folder libs for BUCK to use
task copyDownloadableDepsToLibs(type: Copy) {
    from configurations.compile
    into 'libs'
}

apply plugin: 'com.google.gms.google-services'