为什么我会收到此错误 TypeError: '>' not supported between instances of 'float' and 'Image'?

Question

这是我的代码：

from pyautogui import *
import pyautogui
import time
import keyboard
import random
import win32api, win32con

def click(x,y):
    win32api.SetCursorPos((x,y))
    win32api.mouse_event(win32con.MOUSEEVENTF_LEFTDOWN,0,0)
    time.sleep(random.uniform(0.04, 0.1))
    win32api.mouse_event(win32con.MOUSEEVENTF_LEFTUP,0,0)

def writeToChat(input):
    for i in range(len(input)):
        letter = input[i]
        keyboard.press_and_release(str(letter))
        time.sleep(0.1)

commandDebounce = False
currentDebounceTime = 0
commandDebounceTime = 15

time.sleep(1)

letters = ['a.png', 'b.png', 'c.png', 'd.png', 'e.png', 'f.png', 'g.png', 'h.png', 'i.png', 'j.png', 'k.png', 'l.png', 'm.png','n.png', 'o.png', 'p.png', 'q.png', 'r.png', 's.png', 't.png', 'u.png', 'v.png', 'w.png', 'x.png', 'y.png', 'z.png']

print('start of script')

haystack = None

while keyboard.is_pressed('q') == False:
    msg = ''
    if pyautogui.locateOnScreen('command_text.input.png',confidence=0.8):
        print('Found command')
    
        x,y = pyautogui.locateCenterOnScreen('command_text.input.png',confidence=0.8)
        print(x, y)
    
        win32api.SetCursorPos((x, y))
    
        haystack = pyautogui.screenshot(region=(x + 88, y - 20, 100, 50), imageFilename='screenShot.png')
        for i in range(len(letters)):
            if pyautogui.locateOnScreen(letters[i], haystack):
            
                print(msg)
    
        break
       # if pyautogui.locateOnScreen('command_text.input.png',confidence=0.45):
    

print('End of script')

这是错误：

> Traceback (most recent call last):   File
> "C:\Users\HP\Documents\Bots\CoC\test.py", line 44, in <module>
>     if pyautogui.locateOnScreen(letters[i], haystack):   File "C:\Users\HP\AppData\Local\Programs\Python\Python310\lib\site-packages\pyautogui\__init__.py",
> line 175, in wrapper
>     return wrappedFunction(*args, **kwargs)   File "C:\Users\HP\AppData\Local\Programs\Python\Python310\lib\site-packages\pyautogui\__init__.py",
> line 213, in locateOnScreen
>     return pyscreeze.locateOnScreen(*args, **kwargs)   File "C:\Users\HP\AppData\Local\Programs\Python\Python310\lib\site-packages\pyscreeze\__init__.py",
> line 381, in locateOnScreen
>     if retVal or time.time() - start > minSearchTime: TypeError: '>' not supported between instances of 'float' and 'Image

它应该在看到命令后拍摄屏幕截图并检测它后面的字母。我得到的只是那个错误。