This is the Challenge:

To pass this challenge, create an Apex class that inserts a new account named after an incoming parameter. If the account is successfully inserted, the method should return the account record. If a DML exception occurs, the method should return null.The Apex class must be called 'AccountHandler' and be in the public scope.
The Apex class must have a public static method called 'insertNewAccount'.
The 'insertNewAccount' method must accept an incoming string as a parameter, name the account after the parameter, insert it into the system and then return the account record.
The 'insertNewAccount' method must also accept an empty string, catch the failed DML and return null.


My Class:

public class AccountHandler {

    public static Account insertNewAccount (String accName, Account a) {
         try{   
          a.name = accName;
    
         insert a;
        return a;
        }
        catch(Exception e) {
            return null;
        }
    }    
}






Throwing this error, how many times i modified the class.
what is the correct class.?
 

Easy challenge, copying the code of CloudNewsTrigger and including small changes, but I have stucked with the UserId.

Using this code for OrderEventTrigger you will pass the course:
 

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 task owner
    //Group queue = [SELECT Id FROM Group WHERE Name='Regional Dispatch' LIMIT 1];
     String usr = UserInfo.getUserId();  
    // 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.Status = 'New';
            ts.Subject = 'Follow up on shipped order ' + event.Order_Number__c;
            ts.OwnerId = usr;//queue.Id;
            tasks.add(ts);
        }
   }
    
    // Insert all tasks corresponding to events received.
    insert tasks;

}

Good luck!