This is my code:
def checking():
  response2 = requests.get('https://www.nitrxgen.net/md5db/' + str(word[1])).text  
  if response2:
   print(Fore.GREEN + "[" + Fore.WHITE + strftime("%H:%M:%S")+ Fore.GREEN + "]" + Fore.WHITE + " |" + Fore.GREEN + " ■ " + Fore.WHITE +
    "Hash Found: " + Fore.GREEN + response2 + Style.RESET_ALL + "\n", end='')
  else:
   print(Fore.RED + "[" + Fore.WHITE + strftime("%H:%M:%S")+ Fore.RED + "]" + Fore.WHITE + " |" + Fore.RED + " ■ " + Fore.WHITE +
    "Hash Not Found" + Style.RESET_ALL + "\n", end='')
def Mutiple():
  Tk().withdraw() 
  filename = askopenfilename(title='Choose a File', filetypes=[("Text Files", "*.txt")])
  clear = lambda: os.system('cls')
  clear() 
  with open(filename, "r", encoding="utf8") as file:  
    for line in file:
        word = line.strip()
        word = word.split(":")
        return checking()
And the error code is
Traceback (most recent call last):   
  File "C:\Users\tosun\OneDrive\Desktop\Hashkiller\Hashkiller.py", line 111, in <module>
    Mutiple()   
  File "C:\Users\tosun\OneDrive\Desktop\Hashkiller\Hashkiller.py", line 40, in Mutiple
    return checking()   
  File "C:\Users\tosun\OneDrive\Desktop\Hashkiller\Hashkiller.py", line 18,  in checking
    response2 = requests.get('https://www.nitrxgen.net/md5db/' + str(word[1])).text 
NameError: name 'word' is not defined
 
     
    