[Python] Error from Pycharm: Expected type 'SupportsIndex | slice', got 'str' instead

My input file, infile is as follows:

NUMBER,SYMBOL
1,AAPL
2,MSFT
3,NVDA


Here is my code:

import csv

infile = "stock-symbols-nasdaq-SO.csv"

with open(infile, encoding='utf-8') as csvfile:
reader = csv.DictReader(csvfile) # Read CSV as a dictionary
for row in reader:
print(row)
symbol = row['SYMBOL'] # Error from Pycharm: Expected type 'SupportsIndex | slice', got 'str' instead
print(symbol)


This code "appears" to run correctly, but why is Pycharm indicating an error? Is their anything that I can do to remove it?

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