Jenkins Version is 2.25, Pipeline plugin is the latest one (It was all working fine with Jenkins 2.21 and older pipeline plugins, Jobs have run fine on Oct12,2016)
Have a loop mechanism to iterate through all nodes as below

for(int i = 0; i < nodes.size(); i++) {
def node_name = nodes[i].trim()
def node_id = i
stage ' Triggering Tests on ' + node_name
build job: 'Tests', parameters: [

am getting the below error before the sub job is triggered

java.io.NotSerializableException: java.util.AbstractList$Itr
at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:860)
at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)
at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)
Caused by: an exception which occurred:
in field itr
in field target
in field continue_
in field parent
in field caller
in field e
in field program
in field threads
in object org.jenkinsci.plugins.workflow.cps.CpsThreadGroup@23b3e142