运行流程中指令出错：【未找到窗口】 是什么原因？

在运行的过程中，偶尔会出现这个情况，刷新网页后，流程不做任何调整，又可以找到了。但是有一定的机遇出现这个情况报错。

Traceback (most recent call last):
File "D:\ShadowBot\shadowbot-5.6.26\python\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "D:\ShadowBot\shadowbot-5.6.26\python\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "D:\ShadowBot\shadowbot-5.6.26\python\lib\site-packages\xbot_interpreter.py", line 67, in <module>
main()
File "D:\ShadowBot\shadowbot-5.6.26\python\lib\site-packages\xbot_interpreter.py", line 47, in main
mod.main(args)
File "C:\Users\NING MEI\AppData\Local\ShadowBot\users\10c0f169-b603-4099-a9c3-227dd243519d\apps\e8023fba-6ebf-4b83-8d72-29a1d33ed0f1\xbot_robot\main.py", line 61, in main
xbot_visual.web.element.click(browser=loop_item每次循环到的店铺网址, element=package.selector("块元素_星级/领航员"), simulate=True, move_mouse=False, clicks="click", button="left", keys="null", delay_after="1", anchor_type="center", sudoku_part="MiddleCenter", offset_x="0", offset_y="0", timeout="20", _block=("main", 53, "点击元素(web)"))
File "<string>", line 79, in wrapper
File "<string>", line 74, in wrapper
File "<string>", line 56, in click
File "<string>", line 239, in click
File "<string>", line 21, in _invoke
File "<string>", line 858, in _invoke
File "<string>", line 118, in execute
File "<string>", line 92, in execute
xbot.errors.UIAError: 未找到窗口