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Model States didn't exist twenty years ago... !
Even now that is not the answer unless you are using an outdated version of Inventor; and if that's the case, the better answer is to update Inventor.
As you can see from the last message before yours, the answer for the original poster (an archived user, by the way) was the Vault status of the files in question.
Sam B
Inventor Pro 2023.2 | Windows 10 Home 21H2