DeleteData Python API cannot work

self = <iotdb.Session.Session object at 0x000001B30F5EB2B0>
paths_list = ['root.sg2.d1.s1', 'root.sg2.d1.s2', 'root.sg2.d1.s3']
timestamp = 1

    def delete_data(self, paths_list, timestamp):
        """
        delete all data <= time in multiple time series
        :param paths_list: time series list that the data in.
        :param timestamp: data with time stamp less than or equal to time will be deleted.
        """
        request = TSDeleteDataReq(self.__session_id, paths_list, timestamp)
        try:
>           status = self.__client.deleteData(request)

..\..\iotdb-sdk-test\venv\lib\site-packages\iotdb\Session.py:350: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <iotdb.thrift.rpc.TSIService.Client object at 0x000001B31F2EA2E0>
req = TSDeleteDataReq(sessionId=11, paths=['root.sg2.d1.s1', 'root.sg2.d1.s2', 'root.sg2.d1.s3'], startTime=1, endTime=None)

    def deleteData(self, req):
        """
        Parameters:
         - req
    
        """
        self.send_deleteData(req)
>       return self.recv_deleteData()

..\..\iotdb-sdk-test\venv\lib\site-packages\iotdb\thrift\rpc\TSIService.py:1549: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <iotdb.thrift.rpc.TSIService.Client object at 0x000001B31F2EA2E0>

    def recv_deleteData(self):
        iprot = self._iprot
        (fname, mtype, rseqid) = iprot.readMessageBegin()
        if mtype == TMessageType.EXCEPTION:
            x = TApplicationException()
            x.read(iprot)
            iprot.readMessageEnd()
>           raise x
E           thrift.Thrift.TApplicationException: Required field 'endTime' was not found in serialized data! Struct: org.apache.iotdb.service.rpc.thrift.TSDeleteDataReq$TSDeleteDataReqStandardScheme@75987fe6