Order_Event__e not creating the task successfully

trigger OrderEventTrigger on Order_Event__e (after insert) {
    list<task> tasklist =new  list<task>();
    for(Order_Event__e event:trigger.new) {
    if(event.Has_Shipped__c == true){
       task t =new task();
        t.Priority='Medium';
            t.Subject ='Follow up on shipped order 105';
            t.OwnerId =event.CreatedById;
        tasklist.add(t);
    }
    } insert tasklist;
}

Hi Stephen,

You can try below trigger code.

trigger OrderEventTrigger on Order_Event__e (after insert) {
    List<Task> tasks = new List<Task>();
    for (Order_Event__e event : Trigger.New) {
        if(event.Has_Shipped__c == true){
            Task t = new Task();
            t.Priority='Medium';
            t.Status='New';
            t.Subject='Follow up on shipped order '+event.Order_Number__c ; 
            t.OwnerId =Userinfo.getUserId() ;
            tasks.add(t);
        }
    }
    insert tasks ;
}

And if still face some issue you can also checkout below thread.

https://developer.salesforce.com/forums/?id=9060G000000MSOFQA4

 I hope this will help!! If you find this information useful do mark it as best answer. Thanks

// Trigger for listening to Order events.
trigger OrderEventTrigger on Order_Event__e (after insert) {
    // List to hold all Tasks to be created.
    List<Task> tasks = new List<task>();
    // Get queue Id for case owner
    //Group queue = [SELECT Id FROM Group WHERE Name='Regional Dispatch' AND Type='Queue'];
    // Iterate through each notification.
    for (Order_Event__e event : Trigger.New) {
        if (event.Has_Shipped__c == true) {
            // Create Task to dispatch new team.
            Task ts = new Task();
            ts.Priority = 'Medium';
            ts.Subject = 'Follow up on shipped order 105';
            ts.OwnerId = event.CreatedById;
            tasks.add(ts);
        }
   }
    // Insert all cases corresponding to events received.
    insert tasks;
}