Error Has occurred when i start process

hi all i try to start my process but i got this error(i run my process Successful yesterday but now i got this error).error pic is:


bpmn file is:multi-user-Assignee2.bpmn (5.0 KB)

@Forough, you mentioned script format as Java, but it should be javascript

<bpmn:scriptTask id="GenerateAssignees" name="Generate Assignees1" scriptFormat="java">
    <bpmn:incoming>SequenceFlow_0q23sjj</bpmn:incoming>
    <bpmn:incoming>SequenceFlow_1d0thao</bpmn:incoming>
    <bpmn:outgoing>SequenceFlow_1llmycg</bpmn:outgoing>
    <bpmn:script>var ArrayList = Java.type("java.util.ArrayList");
           var assigneeList= new ArrayList;
           assigneeList.add("behrouz");
           assigneeList.add("forough");
           execution.setVariable("assigneeList", assigneeList); 
   </bpmn:script>
</bpmn:scriptTask>

Thank you for your help

excuse me when i start process from bellow file for every array item make 2 instance .for example 4 parallel instances created when i run this filemulti-user-approval (3).bpmn (4.8 KB)