Hi @Malak ,
Welcome to the community!
I think maybe you are using a butler power-up, so the power-up quota for the free plan must be full or there might be a cache problem.
Clear the cache of the app or browser and then re-open your browser and check if working.
Just create a new board move all your list from the current board to the new board and add the power-up you want.
Follow this documentation for moving lists from one board to another https://help.trello.com/article/806-moving-cards-or-lists
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