for example https://www.theotaku.com/quizzes/view/3538/which_invader_zim_character_are_you%3F should open Invider Zim quiz ,just example

in my profile i have a lot of otaku quizes and i wanted to retake them but i just have an error:

Web server is returning an unknown error

i have a thought that this is my own problem but still need to know how to deal thiz

thanks in case