I tried to migrate to the new trigger syntax as described here:
https://github.com/jenkinsci/job-dsl-plugin/blob/master/docs/Migration.md

But i keep getting the error:

javaposse.jobdsl.dsl.DslScriptException: (script, line 3) No signature of method: javaposse.jobdsl.dsl.helpers.properties.PropertiesContext.pipelineTriggers() is applicable for argument types: (script$_run_closure1$_closure2$_closure4) values: [script$_run_closure1$_closure2$_closure4@16f6b021]javaposse.jobdsl.dsl.DslScriptException: (script, line 3) No signature of method: javaposse.jobdsl.dsl.helpers.properties.PropertiesContext.pipelineTriggers() is applicable for argument types: (script$_run_closure1$_closure2$_closure4) values: [script$_run_closure1$_closure2$_closure4@16f6b021] at javaposse.jobdsl.dsl.AbstractDslScriptLoader.runScriptEngine(AbstractDslScriptLoader.groovy:114) at javaposse.jobdsl.dsl.AbstractDslScriptLoader$_runScripts_closure1.doCall(AbstractDslScriptLoader.groovy:61)

I used the following test code:

pipelineJob ("TestJob") {
    properties {
        pipelineTriggers {
            triggers {
                pollSCM {
                    scmpoll_spec('')
                }
            }
        }
    }
    definition {
        cps {
            sandbox(true)
            script("testPipeline()")
        }
    }
}

I don't know what I'm doing wrong here, anybody?