I have a problem with my sdk version. Please help me

I have currently installed sdk 27.0.1 but it sais that i have a 0.0.0 version. I tried editing the build.gradle in the gradleOut folder but it still tells me that it is 0.0.0

CommandInvokationFailure: Gradle build failed. C:/Program Files/Java/jdk1.8.0_172\bin\java.exe -classpath "D:\fried\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-4.0.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx2048m" "assembleRelease"

stderr[

FAILURE: Build failed with an exception.

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

     **HERE LOOK**
  

  Failed to find Build Tools revision 0.0.0

• Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED in 2s ] stdout[

] exit code: 1 UnityEditor.Android.Command.WaitForProgramToRun (UnityEditor.Utils.Program p, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.Command.Run (System.Diagnostics.ProcessStartInfo psi, UnityEditor.Android.WaitingForProcessToExit waitingForProcessToExit, System.String errorMsg) UnityEditor.Android.AndroidJavaTools.RunJava (System.String args, System.String workingdir, System.Action`1 progress, System.String error) UnityEditor.Android.GradleWrapper.Run (System.String workingdir, System.String task, System.Action`1 progress) Rethrow as GradleInvokationException: Gradle build failed UnityEditor.Android.GradleWrapper.Run (System.String workingdir, System.String task, System.Action`1 progress) UnityEditor.Android.PostProcessor.Tasks.BuildGradleProject.Execute (UnityEditor.Android.PostProcessor.PostProcessorContext context) UnityEditor.Android.PostProcessor.PostProcessRunner.RunAllTasks (UnityEditor.Android.PostProcessor.PostProcessorContext context) UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

HERE COMES THE build.gradle buildscript { repositories { jcenter() }

 dependencies {
     classpath 'com.android.tools.build:gradle:2.3.0'
 }

}

allprojects { repositories { flatDir { dirs 'libs' } } }

apply plugin: 'com.android.application'

dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile(name: 'unity-ads', ext:'aar') compile(name: 'UnityAds', ext:'aar') }

android { compileSdkVersion 27 buildToolsVersion '27.0.1'

 defaultConfig {
     minSdkVersion    16
     targetSdkVersion 27
     applicationId 'com.HannnenheimDev.DodgeIt'
     ndk {
         abiFilters 'armeabi-v7a', 'x86'
     }
     versionCode    1
     versionName    '0.9.0'
 }

 lintOptions {
     abortOnError false
 }

 aaptOptions {
     noCompress '.unity3d', '.ress', '.resource', '.obb'
 }


 buildTypes {
       debug {
          minifyEnabled false
          useProguard false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'
           jniDebuggable true
       }
       release {
          minifyEnabled false
          useProguard false
           proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'
           signingConfig signingConfigs.debug
       }
 }
 packagingOptions {
     doNotStrip "*/armeabi-v7a/*.so"
     doNotStrip "*/x86/*.so"
 }

}