Thank you for your attention.
Following your advice, I rebooted my computer, reinstalled MyBot, and re-established six accounts one by one.
And when I ran the bot by selecting the 5th or 6th account, the same error occurred.
I reinstalled MyBot again, created 6 accounts, and ran it under the 5th account without any settings, and the same error still occurred.
Please let me know if there are other ways to try.