Sometimes this is just because the example contains multiple errors. Other times it is because the fallacies in question have overlapping boundaries. The above example can be plausibly analyzed as the ...

This is an error in the spelling or grammar used when coding. Missing a letter, character or forgetting to include inverted commas/speech marks are common examples of ...

Excel's logical functions test whether ... #NAME?, and #NULL! errors, and the IFERROR helps to prevent this. In this example, ...