\bigcup is not compiling?

I am trying to add some of my analysis notes to my vault and suddenly the LaTeX symbol \bigcup is not working anymore. Other similar symbols (like \bigcap and \sum) seem to work fine, but I get an error when I try to add them to a note. Is there a way to get this back in my notes? I have lots of unions to think about :sweat_smile:

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