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BTW the `vertx-gradle-plugin` has no impact on that

This is what I have:
```plugins {
    id 'io.vertx.vertx-plugin' version '0.0.6'
    id 'org.jetbrains.kotlin.jvm' version '1.2.10'
}

repositories {
    mavenCentral()
    jcenter()
}

dependencies {
    compile 'io.vertx:vertx-lang-kotlin'
   compile 'io.vertx:vertx-lang-kotlin-coroutines'
    compile 'io.vertx:vertx-web'
    compile 'io.vertx:vertx-mysql-postgresql-client'
    compile 'io.vertx:vertx-sql-common'

    compile 'org.jetbrains.kotlin:kotlin-stdlib-jre8'

    def coroutinesVersion = '0.21'
    compile "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutinesVersion"

    testCompile group: 'junit', name: 'junit', version: '4.12'
}

group 'com.comp.api'
version '1.0-SNAPSHOT'

kotlin { experimental { coroutines 'enable' } }

vertx {
    mainVerticle = "MainVerticle"
}

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
    kotlinOptions {
        jvmTarget = "1.8"
    }
}```

You probably need an explicit version number of the vert.x coroutine dependency

Your error is a dependency resolution right? can you paste it?

```Warning:&lt;i&gt;&lt;b&gt;root project 'deviceRegistration': Unable to build Kotlin project configuration&lt;/b&gt;
Details: java.lang.reflect.InvocationTargetException: null
Caused by: org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all files for configuration ':compileClasspath'.
Caused by: org.gradle.internal.resolve.ModuleVersionNotFoundException: Could not find io.vertx:vertx-lang-kotlin-coroutines:.
Required by:
    project :&lt;/i&gt;```

It’s because it’s not part of the `vertx-dependencies` kind of BOM

Thanks! That worked... it might have been nice to be handled by `io.vertx.vertx-plugin`, but I guess nothings' perfect. :wink: