apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
buildToolsVersion "29.0.2"
defaultConfig {
        applicationId "com.example.administrator.myapplication"
minSdkVersion 23
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
    buildTypes {
        release {
            minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
})
    compile 'com.android.support:appcompat-v7:26+'
testCompile 'junit:junit:4.12'
}

报错Failed to Find target with hash String 'android-26' in:E://SDK

我的Android SDK Tools26.1.1
Android platform version：API23：Android 6.0 revision3

Android SDK bulid-Tools：29.0.2