When might I encounter VBA error 400 when working with Excel objects?

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Grade: Education Subject: Support
When might I encounter VBA error 400 when working with Excel objects?
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You might encounter VBA error 400 in Excel when attempting to interact with an Excel object that is not accessible, has been deleted, or is in an invalid state. Examples include trying to reference a worksheet that no longer exists, a chart that has been removed, or a cell that is part of a protected range without proper authorization.