adding build.gradle run configurations (1.15.2)

Howdy 

I'm trying to tweak my build.gradle to add a new run configuration (to reduce the console debug level).

It appears to generate the IDEA gradle tasks fine, but when I run it (clientfewerconsolemessages) it tells me "no main class specified".

Any clues?  I don't know much about Gradle so I'm hoping it's something obvious I'm missing.  I have no idea why it automagically works for "client" but not "clientfewerconsolemessages"

cheers

  TGG

       // Default run configurations.
        // These can be tweaked, removed, or duplicated as needed.
        runs {
            client {
                workingDirectory project.file('run')

                // Recommended logging data for a userdev environment
                property 'forge.logging.markers', 'SCAN,REGISTRIES,REGISTRYDUMP'

                // Recommended logging level for the console
                property 'forge.logging.console.level', 'debug'

                mods {
                    minecraftbyexample {
                        source sourceSets.main
                    }
                }
            }
            clientfewerconsolemessages {
                workingDirectory project.file('run')

                // Recommended logging data for a userdev environment
                property 'forge.logging.markers', 'SCAN,REGISTRIES,REGISTRYDUMP'

                // Recommended logging level for the console
                property 'forge.logging.console.level', 'warn'

                mods {
                    minecraftbyexample {
                        source sourceSets.main
                    }
                }
            }