Error in Whatsapp Automation using Selenium and Python

I tried to send a message to my friend in whatsapp using selenium. I downloaded the chromedriver of latest version for windows , when i ran the code the whatsapp web was opened but the message was not sent . This is my code and the errors i have got :-

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.common.by import By
import time

# Replace below path with the absolute path
# to chromedriver in your computer
*driver = webdriver.Chrome(executable_path=r'D:\Whatsapp Automation\chromedriver.exe')

driver.get("https://web.whatsapp.com/")
wait = WebDriverWait(driver, 600)

# Replace 'Friend's Name' with the name of your friend
# or the name of a group
target = "Friend's name"

# Replace the below string with your own message
string = "Hii"

x_arg = '//span[contains(@title,' + target + ')]'
group_title = wait.until(EC.presence_of_element_located((
    By.XPATH, x_arg)))
group_title.click()
inp_xpath = '//div[@class="input"][@dir="auto"][@data-tab="1"]'
input_box = wait.until(EC.presence_of_element_located((
    By.XPATH, inp_xpath)))
for i in range(100):
    input_box.send_keys(string + Keys.ENTER)
    time.sleep(1)

This is the debug file i have got

[1228/125305.696:ERROR:process_reader_win.cc(123)] NtOpenThread: {Access Denied} A process has requested access to an object, but has not been granted those access rights. (0xc0000022)
[1228/125305.696:ERROR:exception_snapshot_win.cc(99)] thread ID 8952 not found in process
[1228/125305.742:ERROR:process_reader_win.cc(151)] SuspendThread: Access is denied. (0x5)
[1228/125305.758:ERROR:process_reader_win.cc(151)] SuspendThread: Access is denied. (0x5)
[1228/125305.758:ERROR:process_reader_win.cc(151)] SuspendThread: Access is denied. (0x5)
[1228/125305.758:ERROR:process_reader_win.cc(151)] SuspendThread: Access is denied. (0x5)
[1228/125305.758:ERROR:process_reader_win.cc(151)] SuspendThread: Access is denied. (0x5)
[1228/125305.758:ERROR:process_reader_win.cc(151)] SuspendThread: Access is denied. (0x5)
[1228/125305.758:ERROR:process_reader_win.cc(123)] NtOpenThread: {Access Denied} A process has requested access to an object, but has not been granted those access rights. (0xc0000022)
[1228/125305.758:ERROR:exception_snapshot_win.cc(99)] thread ID 10128 not found in process

I downloaded the chromedriver from https://chromedriver.storage.googleapis.com/index.html?path=87.0.4280.88/