unresolved reference: github (cant import to my class) - maven

Question

I tried to download a library. But I think i did something wrong in my build.gradle Project. Because when I try to import the library manually, I get this error:
My Project Gradle File
buildscript {
repositories {
google()
maven {url 'https://jitpack.io'}
}
dependencies {
classpath("androidx.navigation:navigation-safe-args-gradle-plugin:2.5.3")
}
}
plugins {
id 'com.android.application' version '7.2.1' apply false
id 'com.android.library' version '7.2.1' apply false
id 'org.jetbrains.kotlin.android' version '1.7.10' apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}
My App Gradle File
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'kotlin-kapt'
id 'androidx.navigation.safeargs.kotlin'
}
android {
compileSdk 32
defaultConfig {
applicationId "com.ahmetkaan.kediy"
minSdk 23
targetSdk 32
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures {
viewBinding true
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.5.1'
implementation 'com.google.android.material:material:1.7.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
implementation 'androidx.navigation:navigation-fragment-ktx:2.5.3'
implementation 'androidx.navigation:navigation-ui-ktx:2.5.3'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.4'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.0'
//...
implementation 'com.github.onecode369:WYSIWYG:4.0'
}
The library says me to add " maven {url 'https://jitpack.io'} " this to my project gradle and " implementation 'com.github.onecode369:WYSIWYG:4.0' " this to my app gradle. I think there is a problem in the project gradle's repositories (maven). Because the library says to me add like this;
allprojects {
repositories {
...
maven {url 'https://jitpack.io' }
}
}
But I can't add allprojects on top of repositories. I am getting an error like:
A problem occurred evaluating root project 'Kediy'.
> Build was configured to prefer settings repositories over project repositories but repository 'Google' was added by build file 'build.gradle'
What should I do?