Use in studio 3.0.1 and can not find 'xyz.sahildave.mylibrary'

[qlang122]

in android studio 3.0.1 , gradle-4.1-all.
the project build failed,can`t find the class.
output details:

C:\Users\Administrator\Desktop\Flavored-Library-master\app\src\main\java\xyz\sahildave\flavoredlibrary\MainActivity.java:7: 错误: 程序包xyz.sahildave.mylibrary不存在
import xyz.sahildave.mylibrary.LibraryActivity;
^
C:\Users\Administrator\Desktop\Flavored-Library-master\app\src\main\java\xyz\sahildave\flavoredlibrary\MainActivity.java:15: 错误: 找不到符号
Intent intent = new Intent(this, LibraryActivity.class);
^
符号: 类 LibraryActivity
位置: 类 MainActivity
2 个错误

FAILED

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:compileApp1521DebugJavaWithJavac'.

Compilation failed; see the compiler error output for details.

---

but gradle config sysc is no error.

[qlang122]

library build.gradle

apply plugin: 'com.android.library'

android {
buildToolsVersion "26.0.2"

publishNonDefault true

defaultConfig {
    versionCode 1
    versionName "1.0"
    flavorDimensions "default"
}
productFlavors {
    sdk1521 {
        minSdkVersion 15
        targetSdkVersion 26
        compileSdkVersion 26
    }
    sdk1524 {
        minSdkVersion 15
        targetSdkVersion 26
        compileSdkVersion 26
    }
}

}
configurations {
sdk1521Debug
sdk1524Debug
}
dependencies {
// compile 'com.android.support:appcompat-v7:24.2.1'
sdk1524Compile 'com.android.support:appcompat-v7:26.1.0'
sdk1521Compile 'com.android.support:appcompat-v7:26.1.0'
}

app build.gradle

apply plugin: 'com.android.application'

android {
buildToolsVersion "26.0.2"

defaultConfig {
    applicationId "xyz.sahildave.flavoredlibrary"
    versionCode 1
    versionName "1.0"

    flavorDimensions "default"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
productFlavors {
    app1521 {
        minSdkVersion 15
        targetSdkVersion 26
        compileSdkVersion 26
        applicationId "xyz.sahildave.flavoredlibrary.app1521"
    }
    app1524 {
        minSdkVersion 15
        targetSdkVersion 26
        compileSdkVersion 26
        applicationId "xyz.sahildave.flavoredlibrary.app1524"
    }
}

}

configurations {
app1521DebugCompile
app1524DebugCompile
}

dependencies {
// compile 'com.android.support:appcompat-v7:24.1.0'
app1521DebugCompile project(path: ':mylibrary', configuration: 'sdk1521Debug')
app1524DebugCompile project(path: ':mylibrary', configuration: 'sdk1524Debug')
app1521DebugCompile 'com.android.support:appcompat-v7:26.1.0'
app1524DebugCompile 'com.android.support:appcompat-v7:26.1.0'
}