java.lang.NullPointerException
	at java.util.HashSet.<init>(HashSet.java:119)
	at hudson.model.ParametersAction.shouldSchedule(ParametersAction.java:229)
	at hudson.model.Queue.scheduleInternal(Queue.java:618)
	at hudson.model.Queue.schedule2(Queue.java:588)
	at hudson.matrix.MatrixConfiguration.scheduleBuild(MatrixConfiguration.java:512)
	at hudson.matrix.MatrixConfiguration$scheduleBuild.call(Unknown Source)
	at org.jenkinsci.plugins.yamlaxis.BaseMES.scheduleConfigurationBuild(BaseMES.groovy:81)