ArtifactNotFoundException 'com.sonatype.nexus.plugins:nexus-staging-client:jar:2.7.0-02'

building com.jayway.maven.plugins.android.generation2:maven-android-plugin:3.8.3-SNAPSHOT

org.eclipse.aether.transfer.ArtifactNotFoundException:

com.sonatype.nexus.plugins:nexus-staging-client:jar:2.7.0-02

any ideas where to find this artifact?

thanks!
Martin