Apps implementation 'com.android.support:appcompat-v7:28.0.0' (Error)

[Nagori]

I've got this error I tried too many solutions like v7:27.0.0 and also set compileSdkVersion 28 to compileSdkVersion 27 and targetSdkVersion 28 to targetSdkVersion 27 but it's not working yet please help
here is my gradle code:

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'
apply plugin: 'com.google.gms.google-services'

android {
compileSdkVersion 28
defaultConfig {
applicationId "com.example.user.mana"
minSdkVersion 16
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}

dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:28.0.0'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
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.daimajia.easing:library:2.0@aar'
implementation 'com.daimajia.androidanimations:library:2.3@aar'
implementation 'com.desarrollodroide:fragmenttransactionextended:1'
implementation 'com.google.firebase:firebase-auth:16.0.1'
}