Newb Q: auto layout

Working my way through the App Development With Swift book, trying to follow instructions in the Calculator lab, but I get conflicting constraints whenever I try to change the size multiplier of the bottom-left button (p. 271). The buttons remain equal in size (i.e. bottom left button does not become twice the width of the other button), and the update frames button is grayed out. I've gone back over it three or four times and can't find anywhere that I'm not following the book — can anyone help me figure out what's wrong?

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