I'm unable to import or export a particular table. (Other tables are
fine)

When I attempt to do so, I get the message "Unrecognized Database
format in [the path to my file]"

Following said attempt, the database it's trying to import from is now
no longer recognized as an Access file.

I think I remember seeing an error about null values once too.

In fact, it happens whenever I try to copy any data from the table. I
tried to open my table and just do a copy and paste and it gave me the
error as soon as I hit copy.