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How to centre a uiview in Xcode?

I want to centre a uiview in Xcode but it is not working. I can't seem to get it right.

screenshot of what I am doing

screenshot of the the errors

Please I don't understand these. Please, how do I fix it?

You can add Horizolly in Container, Vertically in Container. 在此处输入图片说明

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