Gradle project sync fails with ParseError - android-studio

Question

Gradle keeps failing to sync the project.
I get the following error message:
For best of my understating, the interpreter has an issue with parsing the module's build.gradle file.
Here is my build.gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.b.b3"
minSdkVersion 23
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
maxSdkVersion 28
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility = '1.8'
targetCompatibility = '1.8'
}
buildToolsVersion = '28.0.2'
}
ext {
supportLibrary = "27.0.2"
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'android.arch.navigation:navigation-fragment:1.0.0-alpha06'
implementation 'android.arch.navigation:navigation-ui:1.0.0-alpha06'
implementation 'com.android.support:support-v4:27.1.1'
implementation 'com.android.support:design:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.3'
implementation "com.android.support:design:${supportLibrary}"
implementation 'org.osmdroid:osmdroid-android:6.0.2'
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'
}

Answer 1

Could you check the following setting in your build.gradle file?
dependencies {
classpath 'com.android.tools.build:gradle:xxxxx'
}
I used to have the same problem as you. I don't know why. But I adjusted the above version information and the problem was solved.