Add Event in Unity Editor not work!

Hello, i can’t create new Event FMOD from Unity because i have many banks, so it meet error when BuildTree function in CreateEventPopup.cs

{
var rootGuid = EditorUtils.GetScriptOutput("studio.project.workspace.masterEventFolder.id");
rootFolder = new FolderEntry();
rootFolder.guid = rootGuid;
BuildTreeItem(rootFolder);
wantsMouseMove = true;
banks = new List();
        const string buildBankTreeFunc =
            @"function() {
                var output = """";
                const items = [ studio.project.workspace.masterBankFolder ];
                while (items.length > 0) {
                    var currentItem = items.shift();
                    if (currentItem.isOfType(""BankFolder"")) {
                        currentItem.items.reverse().forEach(function(val) {
                            items.unshift(val);
                        });
                    } else {
                        output += "","" + currentItem.id + currentItem.getPath().replace(""bank:/"", """");
                    }
                }
                return output;
            }";

        string bankList = EditorUtils.GetScriptOutput(string.Format("({0})()", buildBankTreeFunc));
        string[] bankListSplit = bankList.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
        foreach (var bank in bankListSplit)
        {
            var entry = new BankEntry();
            entry.guid = bank.Substring(0, 38);
            entry.name = bank.Substring(38);
            banks.Add(entry);
        }
    }`

when i increaseto bigger 2048 bytes in this function at EditorUtils, it works…

public static string GetScriptOutput(string command)
        {
            byte[] commandBytes = Encoding.UTF8.GetBytes(command);
            try
            {
                ScriptStream.Write(commandBytes, 0, commandBytes.Length);
                byte[] commandReturnBytes = new byte[2048];
                int read = ScriptStream.Read(commandReturnBytes, 0, commandReturnBytes.Length);
                string result = Encoding.UTF8.GetString(commandReturnBytes, 0, read - 1);
                if (result.StartsWith("out():"))
                {
                    return result.Substring(6).Trim();
                }
                return null;
            }
            catch (Exception)
            {
                networkStream.Close();
                networkStream = null;
                return null;
            }
        }

What should i do? many thanks!!