'Unable to Capture View Hierarchy is in a crashed state. The view hierarchy of a crashed process " " .cannot be inspected

I am new to using Xcode, but I have a problem now. I do not know how to solve it. I wrote the code and it worked, but the required drawing did not appear to me? The graphic screen does not pop up.. please helpenter image description here

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c++xcode

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'Unable to Capture View Hierarchy is in a crashed state. The view hierarchy of a crashed process " " .cannot be inspected

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