I can no longer access a password protected Numbers file with the correct password. Error message only says the file "cannot be opened."

I'm using Numbers version 3.2.2.
Suddenly I cannot access my password protected Numbers file with the correct password. I have the correct password written down so I know I haven't made a mistake.
The response box that pops up says that the file cannot be opened. There are no other options for me to choose from.

Also, I tried to open it through an older version of Numbers but it sent this error message.

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