无法在系统中创建更多的线程

各位大神，求帮助

我面临的情况是目前处理100万行以上的excel,在处理过程中出现了“无法在系统中创建更多的线程”

详细报错信息如下：

 (-2147352567, '发生意外。', (0, 'Microsoft Excel', '类 Range 的 AutoFill 方法无效', 'xlmain11.chm', 0, -2146827284), None)
Traceback (most recent call last):
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.10.20\python\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.10.20\python\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.10.20\python\lib\site-packages\xbot_interpreter.py", line 87, in <module>
main()
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.10.20\python\lib\site-packages\xbot_interpreter.py", line 47, in main
try:
File "C:\Users\BAIC\AppData\Local\ShadowBot\users\bf5442fd-06c9-41fc-996e-f2b5e07bdb27\apps\47e21cb9-80e8-4b8b-9b65-a79148483641\xbot_robot\main.py", line 430, in main
], _block=("main", 107, "自动向下填充"))
File "<string>", line 89, in wrapper
File "<string>", line 84, in wrapper
File "<string>", line 82, in run
File "C:\Users\BAIC\AppData\Local\ShadowBot\users\bf5442fd-06c9-41fc-996e-f2b5e07bdb27\apps\47e21cb9-80e8-4b8b-9b65-a79148483641\xbot_extensions\activity_excel_v2\process31.py", line 33, in main
}, _block=("A_03_自动向下填充", 1, "调用模块"))
File "<string>", line 89, in wrapper
File "<string>", line 84, in wrapper
File "<string>", line 37, in invoke_module
File "C:\Users\BAIC\AppData\Local\ShadowBot\users\bf5442fd-06c9-41fc-996e-f2b5e07bdb27\apps\47e21cb9-80e8-4b8b-9b65-a79148483641\xbot_extensions\activity_excel_v2\invoke_modules.py", line 149, in excel_auto_filldown
begin_range.AutoFill(fill_range, int(fill_type))
File "<COMObject Range>", line 3, in AutoFill
File "D:\Program Files (x86)\ShadowBot\shadowbot-5.10.20\python\lib\site-packages\win32com\client\dynamic.py", line 287, in _ApplyTypes_
result = self._oleobj_.InvokeTypes(*(dispid, LCID, wFlags, retType, argTypes) + args)
pywintypes.com_error: (-2147352567, '发生意外。', (0, 'Microsoft Excel', '类 Range 的 AutoFill 方法无效', 'xlmain11.chm', 0, -2146827284), None)