diff --git a/.gitignore b/.gitignore
index e7e6a00a..1917a8d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -58,6 +58,7 @@ build/Makefile
 .python-version
 .gitignore
 temp/
+.venv
 
 # setup.py install 临时文件
 dist
diff --git a/tests/Promise.py b/tests/Promise.py
index 2e37d7f0..cae5cc57 100644
--- a/tests/Promise.py
+++ b/tests/Promise.py
@@ -30,7 +30,7 @@ class Promise(object):
             raise res[1]
         else:
             et, ev, tb = res[1]
-            raise et, ev, tb
+            raise et(ev).with_traceback(tb)
     
     def set_exception(self, valueOrType, val=None, tb=None):
         if val is None:
diff --git a/vnpy/trader/gateway/bitmexGateway/bitmexGateway.py b/vnpy/trader/gateway/bitmexGateway/bitmexGateway.py
index 95745adb..855efcf9 100644
--- a/vnpy/trader/gateway/bitmexGateway/bitmexGateway.py
+++ b/vnpy/trader/gateway/bitmexGateway/bitmexGateway.py
@@ -6,6 +6,7 @@
 
 from __future__ import print_function
 
+import logging
 import os
 import json
 import hashlib
@@ -469,7 +470,7 @@ class BitmexWebsocketApi(WebsocketClient):
         e.errorMsg = exceptionValue
         self.gateway.onError(e)
         
-        traceback.print_exc()
+        sys.stderr.write(self.exceptionDetail(exceptionType, exceptionValue, tb))
     
     #----------------------------------------------------------------------
     def writeLog(self, content):
@@ -573,8 +574,9 @@ class BitmexWebsocketApi(WebsocketClient):
         trade.tradeID = tradeID
         trade.vtTradeID = '.'.join([trade.gatewayName, trade.tradeID])
         
-        if 'side' not in d:
-            print('no side : \n', d)
+        # bug check:
+        if d['side'] not in directionMapReverse:
+            logging.debug('trade wthout side : %s', d)
             return
         
         trade.direction = directionMapReverse[d['side']]
diff --git a/vnpy/trader/vtEngine.py b/vnpy/trader/vtEngine.py
index 489a6dfd..63499977 100644
--- a/vnpy/trader/vtEngine.py
+++ b/vnpy/trader/vtEngine.py
@@ -413,7 +413,7 @@ class DataEngine(object):
         self.workingOrderDict = {}  # 可撤销委托
         self.tradeDict = {}
         self.accountDict = {}
-        self.positionDict= {}
+        self.positionDict = {}
         self.logList = []
         self.errorList = []