我在使用android studio 3.0.1时遇到了一个问题，当我尝试构建gradle项目时，我收到了以下消息"Could not find method implementationSDKVersion()"
我的gradle版本是4.1和android插件版本是3.0.1
下面是我完整build.gradle文件

apply plugin: 'com.android.application'

android {
 implementationSdkVersion 26 //error on this line
 defaultConfig {
    applicationId "com.anatech.evidencereporter"
    minSdkVersion 16
    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 {
 implementation fileTree(dir: 'libs', include: ['*.jar'])
 implementation 'com.android.support:appcompat-v7:26.1.0'
 implementation 'com.android.support:design:26.1.0'
 implementation 'com.android.support.constraint:constraint-layout:1.0.2'

 implementation 'com.google.firebase:firebase-core:11.4.2'
 implementation 'com.google.firebase:firebase-database:11.4.2'
 implementation 'com.google.firebase:firebase-storage:11.4.2'
 implementation 'com.firebaseui:firebase-ui-auth:3.1.0'
 implementation 'com.firebaseui:firebase-ui-database:3.1.0'

 implementation 'com.google.android.gms:play-services-places:11.4.2'
 implementation 'com.github.bumptech.glide:glide:3.7.0'

 testImplementation 'junit:junit:4.12'

}

apply plugin: 'com.google.gms.google-services'

有什么建议吗？