Why can't I upvote this answer?

Maybe it is because it is owned by System, but then, there are other answers owned by System that already have upvotes.

Note that I don't have any problems to upvote other answers on the same question.

(Unrelated observation: The link seems to position the page at the end of the question instead of the beginning.)

is a duplicate

This question has been asked before and has already been answered. It should be marked as a duplicate.

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not constructive

This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.

Communities

Why can't I upvote this answer?

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