Error on run Android

[Driaan]

Hi I recieve the following error log when I try running the version 0.1.0 on my android app.

• Error running Gradle:
  ProcessException: Process exited abnormally:

Configure project :app
WARNING: API 'variant.getMergeAssets()' is obsolete and has been replaced with 'variant.getMergeAssetsProvider()'.
It will be removed at the end of 2019.
For more information, see https://d.android.com/r/tools/task-configuration-avoidance.
To determine what is calling variant.getMergeAssets(), use -Pandroid.debug.obsoleteApi=true on the command line to display more information.
WARNING: API 'variantOutput.getProcessResources()' is obsolete and has been replaced with 'variantOutput.getProcessResourcesProvider()'.
It will be removed at the end of 2019.
For more information, see https://d.android.com/r/tools/task-configuration-avoidance.
To determine what is calling variantOutput.getProcessResources(), use -Pandroid.debug.obsoleteApi=true on the command line to display more information.

FAILURE: Build completed with 2 failures.

1: Task failed with an exception.

• Where:
  Build file 'C:\Users[redacted]\Downloads\flutter_windows_v1.10.5-dev\flutter.pub-cache\hosted\pub.dartlang.org\christian_picker_image-0.1.0\android\build.gradle' line: 20

• What went wrong:
  A problem occurred evaluating project ':christian_picker_image'.

Could not get unknown property 'kotlin_version' for object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

• 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.
  ==============================================================================

2: Task failed with an exception.

• Where:
  Script 'C:\Users[redacted]\Downloads\flutter_windows_v1.10.5-dev\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 320

• What went wrong:
  A problem occurred configuring project ':christian_picker_image'.

Could not get unknown property 'android' for project ':christian_picker_image' of type org.gradle.api.Project.

• 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

BUILD FAILED in 3s
Command: C:\Users[redacted]\Documents[redacted][redacted]\android\gradlew.bat app:properties

[diepnghitinh]

You can consult my build.gradle
android/build.gradle

buildscript {
    ext.kotlin_version = '1.3.0'
    ext.supportLibraryVersion = '26.1.0'
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.3.1'
        classpath 'com.google.gms:google-services:4.3.0'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        maven { url 'https://jitpack.io' }
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

android/app/src/build.gradle

def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

def keystorePropertiesFile = rootProject.file("key.properties")
def keystoreProperties = new Properties()
if (keystorePropertiesFile.exists()) {
    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
}

android {
    compileSdkVersion 28

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.test.app"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode = 16
        versionName '1.0.5'
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    signingConfigs {
        release {
            keyAlias keystoreProperties['keyAlias']
            keyPassword keystoreProperties['keyPassword']
            storeFile file(keystoreProperties['storeFile'])
            storePassword keystoreProperties['storePassword']
        }
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.release
            //signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

configurations.all {
    resolutionStrategy.eachDependency { DependencyResolveDetails details ->
        def requested = details.requested
        if (requested.group == "com.android.support") {
            if (!requested.name.startsWith("multidex")) {
                details.useVersion "26.+"
            }
        }
    }
}

dependencies {
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'

    implementation 'com.android.support:support-v4:28.0.0-rc01'
    implementation 'com.android.support:support-annotations:28.0.0'
    implementation ('com.google.firebase:firebase-messaging:17.6.0') {
        exclude group: 'com.android.support'
    }
    implementation 'com.google.code.gson:gson:2.8.2'
    implementation 'org.jetbrains.kotlin:kotlin-reflect:1.1.51'
}
apply plugin: 'com.google.gms.google-services'