ActiveAndroid lib issue

Question

Getting error given below when adding this line of code in build.gradle. I am following given link here for activeandroid and given .jar at this link is also not compatible for java 8. [https://github.com/pardom/ActiveAndroid/wiki/Getting-started][1]

repositories {
    mavenCentral()
    maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
}

compile 'com.michaelpardo:activeandroid:3.1.0-SNAPSHOT'

Error:(39, 0) Could not find method compile() for arguments [com.michaelpardo:activeandroid:3.1.0-SNAPSHOT] on project ':app' of type org.gradle.api.Project.