publish my android aar to jcenter

I want to upload my android aar to the bintray.I reafer to this ,but when I execute the cmd #gradlew bintrayUpload,the cmd show error message,and my gradle file as follow:

bintray {
    user = properties.getProperty('bintray.user')
    key = properties.getProperty('bintray.apikey')
    configurations = ['published', 'archives']

    dryRun = false
    publish = true

    pkg {
        repo = 'maven'
        name = 'ActionAnimatorSet'

        desc = 'An animator operation set on Android'

        websiteUrl = 'https://github.com/paulyung541/ActionAnimatorSet'
        issueTrackerUrl = 'https://github.com/paulyung541/ActionAnimatorSet/issues'
        vcsUrl = 'https://github.com/paulyung541/ActionAnimatorSet.git'

        licenses = ['GNU GENERAL PUBLIC LICENSE, Version 3.0']
        labels = ['Android', 'ObjectAnimator', 'AnimatorSet']
        publicDownloadNumbers = true

        version {
            name = '1.0.0'
            desc = 'first version'
            vcsTag = '1.0'
        }
    }
}

publishing {
    publications {
        Publication(MavenPublication) {
            groupId 'com.paulyung'
            artifactId 'actionanimset'
            version '1.0.0'
        }
    }
}

I already setup a maven in bintray,but the cmd always point out that I don't have a maven.