From 8684e4c15ce9269e1a867a03eb0c3811fe7dcf4a Mon Sep 17 00:00:00 2001
From: "vn.py" <xiaoyou.chen@foxmail.com>
Date: Thu, 11 Apr 2019 14:04:35 +0800
Subject: [PATCH] [Fix]add traceback import

---
 vnpy/app/cta_backtester/engine.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vnpy/app/cta_backtester/engine.py b/vnpy/app/cta_backtester/engine.py
index 621330d2..adcab59d 100644
--- a/vnpy/app/cta_backtester/engine.py
+++ b/vnpy/app/cta_backtester/engine.py
@@ -1,5 +1,6 @@
 import os
 import importlib
+import traceback
 from datetime import datetime
 from threading import Thread
 from pathlib import Path
@@ -8,8 +9,7 @@ from vnpy.event import Event, EventEngine
 from vnpy.trader.engine import BaseEngine, MainEngine
 from vnpy.app.cta_strategy import (
     CtaTemplate,
-    BacktestingEngine,
-    OptimizationSetting
+    BacktestingEngine
 )