Failed to build, anything I did wrong?

[Donzhu2020]

I created libs folder under android and put mdslib-3.15.0-release.aar in it and followed the instructions but failed. So I move the libs folder to android/app, in app level build.gridle I added dependencies { implementation(name: 'mdslib-3.15.0-release', ext: 'aar') }

android { namespace "com.example.smart" compileSdk flutter.compileSdkVersion ndkVersion flutter.ndkVersion

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8

repositories {

    flatDir {
        dirs 'libs'
    }
}
}

In the project level build.gradle I followed the instruction allprojects { repositories { google() mavenCentral() flatDir{ dirs 'libs'

    }
}

} But still cannot build, FAILURE: Build failed with an exception.

• What went wrong: Execution failed for task ':mdsflutter:generateDebugRFile'.

  Could not resolve all files for configuration ':mdsflutter:debugCompileClasspath'. Could not find any matches for :mdslib:+ as no versions of :mdslib are available. Required by: project :mdsflutter

• Try:

  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

BUILD FAILED in 16s Error: Gradle task assembleDebug failed with exit code 1

Need help