I just started my first kotlin project using ktor referring

<http://ktor.io/quickstart/gradle>

I'm getting error

Could not get unknown property 'ktor_version' for object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.

Below is the dependencies I'm using in build gradle file

dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    compile "io.ktor:ktor-server-netty:$ktor_version"
    testCompile group: 'junit', name: 'junit', version: '4.12'
}

and what is your $ktor_version?

Thanks @bmourat It worked for me, by updating the ktor line to

compile group: 'io.ktor', name: 'ktor-server-netty', version: '0.9.0'