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                                            softbug123

user_trader.ReqQryInstrument("",0) get error

File "C:\Program Files (x86)\Microsoft Visual Studio\Shared\Python36_64\lib\site-packages\ctpwrapper\Trader.py", line 279, in ReqQryInstrument return super(TraderApiPy, self).ReqQryInstrument(pQryInstrument, nRequestID) File "ctpwrapper\TraderApi.pyx", line 502, in ctpwrapper.TraderApi.TraderApiWrapper.ReqQryInstrument TypeError: invalid type how to solve it?