Error with showing a file

I just created an account on fibery and uploaded a file in one of my tasks and i want it to be visible for everyone but i have a problem with it cuz sometimes it shows not my task file but an error such as:

{"message":"Failed authorize to fibery by cookie. Request failed with status code 500"}

like other people from their accounts cannot see it because they authorized under themselves or what? How to make my file visible for everyone?
Thank you!