[Python] Python 3 openpyxl UserWarning: Data Validation extension not supported

So this is my first time that I'm attempting to read from an Excel file and I'm trying to do so with the openpyxl module. My aim is to collate a dictionary with a nested list as its value. However, when I get this warning when I try to run it:

UserWarning: Data Validation extension is not supported and will be removed warn(msg)

I don't know where I'm going wrong. Any help would be much appreciated. Thanks

import openpyxl
try:
wb = openpyxl.load_workbook("Grantfundme Master London.xlsx")
except FileNotFoundError:
print("File could not be found.")

sheet = wb["FUNDS"]

database = {}
for i in range(250):#this is the number of keys I want in my dictionary so loop through rows
charity = sheet.cell(row=i + 1, column=1).value

area_of_work = []
org = []
funding = sheet.cell(row=i + 1, column=14).value

for x in range(8, 13): # this loops through columns with info I need
if sheet.cell(row=i +1, column=x).value !="":
area_of_work.append(sheet.cell(row=i +1, column=x).value)

for y in range(3, 6): # another column loop
if sheet.cell(row=i +1, column=y).value !="":
org.append(sheet.cell(row=i +1, column=y).value)

database[charity] = [area_of_work,org, funding]

try:
f = open("database.txt", "w")
f.close()
except IOError:
print("Ooops. It hasn't written to the file")


For those asking here is a screenshot of the exception: (

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