I am trying to define a propertiesFile using Jenkins Job DSL Plugin.

Here is my line of code that is causing the ERROR: (script, line 108) No signature of method: 
 steps {
 propertiesFile("email\_update.prop")  

 }

javaposse.jobdsl.dsl.helpers.step.StepContext.propertiesFile() is applicable for argument types: (java.lang.String) values: [email\_update.prop]
Does anyone know the correct syntax to specify a propertiesFile in Jenkins Job DSL?