Objective: {objective 0x7fb7a49de030: <750:216, 250:2804> + <750:-9.93411e-08>*0x7fb7a4d254b0.negError{id: 1392} + <750:-9.93411e-08>*UIButton:0x7fb7a4b87750.Width{id: 1233}} libc++abi.dylib: terminate_handler unexpectedly threw an exception
when i push or present a ViewController it crashed,this is the crash message,how to resolve it ?