ios - Why Xcode don't prompt a crash reason? -

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i have issue long time. xcode not prompt more information compiling error.

if create new project, xcode show error reason.

normal

but in project, not show detail information error.

error

i have no idea resolve issue.

os x: 10.11.5 xcode: 7.3.1

some known exception can catched xcode , shown right error description.
can add allexception break point make code break onthrow inspect/debug code enter image description here ![enter image description here


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