Hi Kelvin,
Yeah, that’s reported here, try to save the job the first time to get work. Alternatively, you can use the HTTP notification plugin.
The 1.0.6 version has some problems with the latest Rundeck version so, you need to compile the latest version:
1) Download the source code from the repository (in a zip format or just clone the repository).
2) Execute ./gradlew build
inside the plugin directory, after the compilation, the plugin would be available in the build/libs
directory.
3) Copy the jar file to the Rundeck libext directory.
4) Configure the HTTP notification in the Rundeck job. Check this and this.
Hope it helps!