This is what my code is suppose to be doing: 
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.


public class AccountHandler {

    public static Account insertNewAccount(String accName){
        if(accName!=''){    
            try{
                Account a = new Account(Name=accName);
                insert a;    
                return a;
            } catch(Exception e){
                
                return null;
            }
        } else {
        return null;
        }
    }
}

When I test it inside of the execute anonymous window, I input "insertNewAccount('abcd');". I get an error saying "Method does not exist or incorrect signature: void insertNewAccount(String) from the type anon"