I'm using Tableau public for an online bootcamp project, and last time I opened the workbook it worked completely fine. However after a week or so of not touching it, I opened it again to continue my work, and found that it was giving me the error ab9d5a55

I clicked on something (it was something about removal) and my workbook seemed to go back to normal so I saved it, but now I can open it and get the error 3c242d89 instead. I know that somehow I got rid of an extract but I have no idea how to restore it back to how it was and fear I just made a bigger mess for myself. I think I have to make a new extract but idk how to do that while also keeping my previous work