MAX30102 sensor SEN0344 i cannot read data through UART on raspberry pi

Following the information available on the page https://wiki.dfrobot.com/Heart_Rate_and_Oximeter_Sensor_V2_SKU_SEN0344

i have download the program in my raspberry pi device and connected the sensor to the UART port which is at dev/ttyS0
all the connections are correct using the library available at https://github.com/DFRobot/DFRobot_BloodOxygen_S/tree/master/python/raspberry
 

made all the required changes still showing error

Traceback (most recent call last):
 File "/home/pi/Desktop/dfrobot_max30102/max30102_test.py", line 50, in <module>
   setup()
 File "/home/pi/Desktop/dfrobot_max30102/max30102_test.py", line 36, in setup
   while (False == max30102.begin()):
 File "/home/pi/Desktop/dfrobot_max30102/DFRobot_BloodOxygen_S.py", line 64, in begin
   rbuf = self.read_reg(0x04,2)
 File "/home/pi/Desktop/dfrobot_max30102/DFRobot_BloodOxygen_S.py", line 205, in read_reg
   return self.read_holding_registers(0x20,int(math.ceil(reg_addr/2)),int(math.ceil(length/2)))[1:]
 File "/home/pi/Desktop/dfrobot_max30102/DFRobot_RTU.py", line 264, in read_holding_registers
   self._send_package(l)
 File "/home/pi/Desktop/dfrobot_max30102/DFRobot_RTU.py", line 385, in _send_package
   self._clear_recv_buffer()
 File "/home/pi/Desktop/dfrobot_max30102/DFRobot_RTU.py", line 361, in _clear_recv_buffer
   remain = self._ser.inWaiting()
 File "/usr/lib/python3/dist-packages/serial/serialutil.py", line 590, in inWaiting
   return self.in_waiting
 File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 467, in in_waiting
   s = fcntl.ioctl(self.fd, TIOCINQ, TIOCM_zero_str)
OSError: [Errno 25] Inappropriate ioctl for device

please help me solving the issue