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Of course they are an error, what are you talking about.
Error: A mistake; an accidental wrong action or a false statement not made deliberately
It’s a common dictionary, which is probably not very good in this context. I think it would be more appropriate to refer to ISTQB, as it is likely the most relevant source when it comes to software testing and failures:
Or to put it simple:
We’re seeing a failure here.
- Hier to the Empire, by Timothy Zahn