publishing-artifacts exercise does not work

[sofusalbertsen]

~/git/gradle-katas/publishing-artifacts/exercise$ ./gradlew tasks

FAILURE: Build failed with an exception.

* Where:
Build file '/home/sofus/git/gradle-katas/publishing-artifacts/exercise/build.gradle' line: 1

* What went wrong:
A problem occurred evaluating root project 'exercise'.
> Could not find method publishing() for arguments [build_edrexdxwvmzjr9xxj4m5p8sdz$_run_closure1@2cec988e] on root project 'exercise' of type org.gradle.api.Project.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org