运行poco().click报错， 但是单独在airtestIDE跑这段语句正常 about poco HOT 7 CLOSED

class test002(unittest.TestCase):

    def setUp(self):
        print "开始启动游戏"
        normal_start()
        self.poco = StdPoco(15004, device)

Traceback (most recent call last):
  File "D:\Program Files (x86)\JetBrains\PyCharm Community Edition 4.0.6\helpers\pycharm\utrunner.py", line 116, in <module>
    modules = [loadSource(a[0])]
  File "D:\Program Files (x86)\JetBrains\PyCharm Community Edition 4.0.6\helpers\pycharm\utrunner.py", line 40, in loadSource
    module = imp.load_source(moduleName, fileName)
  File "C:\sgame\scripts\test002.py", line 12, in <module>
    from lib.common import normal_start,normal_exit,pic_dir_setting,return_panel,pic_dir
  File "C:\sgame\lib\common.py", line 16, in <module>
    poco = StdPoco(15004, device)
  File "C:\Python27\lib\site-packages\poco\drivers\std\__init__.py", line 93, in __init__
    agent = StdPocoAgent((ip, port))
  File "C:\Python27\lib\site-packages\poco\drivers\std\__init__.py", line 28, in __init__
    self.c.connect()
  File "C:\Python27\lib\site-packages\poco\utils\simplerpc\rpcclient.py", line 23, in connect
    self._wait_connected(timeout)
  File "C:\Python27\lib\site-packages\poco\utils\simplerpc\rpcclient.py", line 37, in _wait_connected
    raise RpcConnectionError("Rpc Connection Closed")
poco.utils.simplerpc.simplerpc.RpcConnectionError: Rpc Connection Closed
[10:48:19][DEBUG]<airtest.core.android.adb> C:\Python27\lib\site-packages\airtest\core\android\static\adb\windows\adb.exe -s ce12160cc43a001f0c forward --remove tcp:19378

Error
Traceback (most recent call last):
  File "C:\sgame\scripts\test002.py", line 31, in test_change_name
    if poco("imgHead").exists:
NameError: global name 'poco' is not defined

poco = None

class test002(unittest.TestCase):

    def setUp(self):
        print "开始启动游戏"
        normal_start()
        global poco
        poco = StdPoco(15004, device)