＆＃34;无法同时满足约束条件＆＃34;当Xcode 7.3中没有约束时

Question

使用OS 9.3.1在iPhone SE上运行时，我开始收到以下内容

Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. 
    Try this: 
        (1) look at each constraint and try to figure out which you don't expect; 
        (2) find the code that added the unwanted constraint or constraints and fix it. 
(
    "<NSLayoutConstraint:0x145d510c0 V:|-(20)-[UIInputSetContainerView:0x145d4f4e0]   (Names: '|':UITextEffectsWindow:0x145d47bf0 )>",
    "<NSLayoutConstraint:0x145d47140 'UIInputWindowController-top' V:|-(0)-[UIInputSetContainerView:0x145d4f4e0]   (Names: '|':UITextEffectsWindow:0x145d47bf0 )>"

我在模拟器中没有问题（使用iPhone 5）。我无法忽略它，因为当我关闭另一个视图控制器时应用程序崩溃。

我将所有UI元素减少为无，但仍然出现此错误。我使用Debug View Hierarchy停止了代码，但是没有任何UIView约束引用匹配错误中列出的约束。