@ahmad
It looks like you're trying to load these characters through the browser's address bar, like "VL8LIKZ7fPQ". Probably you have some problem in the logic of the script.
Yes, i also faced this problem, what i did was if file size was > 100kb then i delete cookies and bot will check if cookies are not present then it will call login function and new cookies file will be saved which will be less than 100 kb.