I want to assign the task to multiple users,using multi instance parallel flow
I am using collection Object as below
Creating list object in listeners
var DocList ={
What error do you get exactly and when? Which version of Camunda are you using? What should the service task do in the end? Is there a reason why you use Connectors? Might be easier to use an External Task or a Java Delegate depending on your architecture and intention.
Just a hint for your model: After User A you use a conditional sequence flow. As this is the only outgoing sequence flow there is no need to use a condition. In general I would recommend not to use the conditional sequence flows and rather stick to the gateways. That makes the model more readable and transparent.