Unable to create description in descriptionForLayoutAttribute_layoutItem_coefficient. Something is nil

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Unable to create description in descriptionForLayoutAttribute_layoutItem_coefficient. Something is nil

本来就是简单的页面，QA测出了问题了，大概是AutoLayout的问题，ios7中点击按钮就崩溃，但是ios中无事。求解！！！在线等

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nil unable create