Running this Job DSL

job('a-test-build') {
  properties {
    promotions {
      promotion {
        name('Deploy a-test to Production')
        icon('star-gold')
        conditions {
          manual('bob')
        }
        actions {
          actions {
              triggerBuilder {
              configs {
                blockableBuildTriggerConfig {
                  projects('a-test-deploy-prod')
                  block {
                    buildStepFailureThreshold('FAILURE')
                    failureThreshold('FAILURE')
                    unstableThreshold('UNSTABLE')
                  }
                  configs {
                    predefinedBuildParameters {
                      properties('X=Y')
                      textParamValueOnNewLine(false)
                    }
                  }
                }
              }
              }
          }
        }
      }
    }
  }
}

Results in

java.lang.ClassCastException: java.lang.String cannot be cast to groovy.util.Node

Using

actions {

  steps {

  ...

  }

}

Runs without errors, but is not the desired job result I need. Using a single "steps{}" also results in same ClassCastException.

Any help is very much appreciated.