Can't access DB - Consistency check needed, Updall, Compact won't run... Invalid or Nonexistent Document

I can’t access a database because everytime I try to access it by ACL or opening it or even viewing the properties of it, I get an error saying: “This database cannot be opened because a consistency check of it is needed.”

But if I try and run Updall or Fixup or Compact on this database, none of them work and I get an error that says:

“Database compactor error: Invalid or nonexistent document” OR

“Index update process shutdown: Invalid or nonexistent document” OR

“Unable to fixup database e:\path\db.nsf: Invalid or nonexistent document”

Someone please help! Thanks!

Subject: try ‘compact -c -i’