read_data_by_identifier exception about python-udsoncan HOT 4 CLOSED

import udsoncan
from udsoncan.connections import IsoTPSocketConnection
from udsoncan.client import Client
import udsoncan.configs
import struct

class MyCustomCodecThatShiftBy4(udsoncan.DidCodec):
   def encode(self, val):
      val = (val << 4) & 0xFFFFFFFF # Do some stuff
      return struct.pack('<L', val) # Little endian, 32 bit value

   def decode(self, payload):
      val = struct.unpack('<L', payload)[0]  # decode the 32 bits value
      return val >> 4                        # Do some stuff (reversed)

   def __len__(self):
      return 4    # encoded payload is 4 byte long.


config = dict(udsoncan.configs.default_client_config)
config['data_identifiers'] = {
   'default' : '>H',                      # Default codec is a struct.pack/unpack string. 16bits little endian
   0x1234 : MyCustomCodecThatShiftBy4,    # Uses own custom defined codec. Giving the class is ok
   0x1235 : MyCustomCodecThatShiftBy4(),  # Same as 0x1234, giving an instance is good also
   0xF190 : udsoncan.AsciiCodec(15)       # Codec that read ASCII string. We must tell the length of the string
   }

# IsoTPSocketconnection only works with SocketCAN under Linux. Use another connection if needed.
conn = IsoTPSocketConnection('vcan0', rxid=0x123, txid=0x456)
with Client(conn,  request_timeout=2, config=config) as client:
   response = client.read_data_by_identifier([0xF190])
   print(response.service_data.values[0xF190]) # This is a dict of DID:Value

   # Or, if a single DID is expected, a shortcut to read the value of the first DID
   vin = client.read_data_by_identifier_first(0xF190)
   print(vin)  # 'ABCDE0123456789' (15 chars)