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Newbie question. Best/quickest way to solve saving problem

Hi, i’m really just a beginner in plotly. Found it yesterday while looking for graph making platforms! For now, i’m just experimenting with the site’s editing interface and what it offers for free. I made some graphs, but since i deleted, by mistake, some rows from a grid (i remade them) i can’t seen to be able to save my work.

The error message is this: “Some uids requested do not exist in the grid.”.
How can i solve this?

sorry for my confusing english btw.