我的compileSdkVersion设置为30，但Android Studio显示错误，它'；设置为29

我正在尝试构建一个颤振应用程序，但每当我在Android studio中点击“打开以进行编辑”后尝试同步渐变时，就会出现

gradle build

错误。显示这个不应该存在的奇怪错误。我的应用程序运行在API Level 30 emulator上，它运行得非常好，只是这是一个问题，而不仅仅是修复问题。请帮帮我，这不管用，我被困在这里好几个星期了。下面是app/build.gradle文件

Error: The compileSdkVersion (29) should not be lower than the targetSdkVersion (30) 
[GradleCompatible]
  compileSdkVersion 29



    def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 30

    lintOptions {
        disable 'InvalidPackage'
    }

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.reonemoretimewaapp"
        minSdkVersion 16
        targetSdkVersion 30
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
    buildToolsVersion '30.0.3'
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

---

您可以共享您的应用程序/构建.gradle吗？CompileSDK版本不能低于TargetSDK版本。两个都使用相同的数字。请显示完整的android/app/build.gradle文件。看起来没问题。尝试

flatter clean

并重新构建。