Cannot get property 'dependencies' on extra properties extension as it does not exist

回答: 这个错误是由于在build.gradle文件中缺少相应的属性导致的。根据引用\[1\]和引用\[2\]的建议，你需要在extra properties extension中添加buildToolsVersion和compileSdkVersion属性。具体的解决方法是在build.gradle文件中添加以下代码：

android {
    // 添加buildToolsVersion属性
    buildToolsVersion "版本号"

    // 添加compileSdkVersion属性
    compileSdkVersion 版本号
}

此外，根据引用\[3\]的建议，你还需要在dependencies块中添加相应的依赖项。具体的解决方法是在build.gradle文件中的dependencies块中添加以下代码：

dependencies {
    implementation fileTree(dir: 'libs', include: \['*.jar'\])
    implementation rootProject.ext.dependencies.appcompat
    implementation rootProject.ext.dependencies.constraintlayout
    testImplementation rootProject.ext.testDependencies.junit
    androidTestImplementation rootProject.ext.testDependencies.runner
    androidTestImplementation rootProject.ext.testDependencies.espresso_core
}

通过以上的修改，你应该能够解决这个错误。
#### 引用[.reference_title]
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