Gradle error: configuration declares dependency which is not declared

Question

I'm making my first android wear app, but I can't get Android Studio working. First I got the error

 "Project with path ':wear' could not be found in project ':mobile'. 

This was resolved by adding "include ':wear" in settings.gradle.
But then a new error occurs:

"Error:Module version Test2:mobile:unspecified, configuration 'wearApp' declares a dependency on configuration 'default' which is not declared in the module descriptor for Test2:wear:unspecified" .

What do I have to do to resolve that error?

Just in case it's needed: here's build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.verbraeken.joost.test2"
        minSdkVersion 19
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    wearApp project(':wear')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.google.android.gms:play-services:8.3.0'
    compile 'com.android.support:design:23.1.1'
}

settings.gradle:

include ':mobile'
include ':wear'

Answer 1

In Android Studio 3.0 the documentation for Migrate to the New Plugin says:

dependencies {
    // This is the old method and no longer works for local
    // library modules:
    // debugCompile project(path: ':foo', configuration: 'debug')
    // releaseCompile project(path: ':foo', configuration: 'release')

    // Instead, simply use the following to take advantage of
    // variant-aware dependency resolution. You can learn more about
    // the 'implementation' configuration in the section about
    // new dependency configurations.
    implementation project(':foo')

    // You can, however, keep using variant-specific configurations when
    // targeting external dependencies. The following line adds 'app-magic'
    // as a dependency to only the 'debug' version of your module.

    debugImplementation 'com.example.android:app-magic:12.3'
}

So change this

    debugCompile project(path: ':foo', configuration: 'debug')
    releaseCompile project(path: ':foo', configuration: 'release')

to this

    implementation project(':foo')