Study doesn't open anymore

I made a study (lot of work) and now I can't open it anymore, allthough I see it in my studies. The link I get is Does anyone know what has happend

greetings NielsvdMark

This is the original link, wich I send to my stydents. ( Last week it worked, now it doesn't work. Strange right?
If I can't open it, I also can't clone it, right?

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