Pyautogui gives me a Key Error in Win7 64-Bit

Question

i'm using PyautoGUI v0.9.52 with Python 3.7.7, and my "+" Key is always changed to "*" when i run the code below. I tried to put the character + in typewrite Method but it appears as * too. Is this a bug in PyautoGUI? Can anyone help me? Thank you.

import pyautogui

pyautogui.PAUSE = 2

pyautogui.hotkey("winleft", "r")
pyautogui.typewrite("calc", interval = 1)
pyautogui.press("enter")

pyautogui.hotkey("alt", "2")
pyautogui.press("1")
pyautogui.press("8")
pyautogui.press("+")
pyautogui.press("3")
pyautogui.press("enter")