command+s crash

[Tang910103]

💉 Injection connected, watching /Volumes/DATA/VestBag/test/**
2019-06-25 12:05:06.992135+0800 test[8664:270015] [framework] CUIThemeStore: No theme registered with id=0
💉 *** Compiling /Volumes/DATA/VestBag/test/test/ViewController.swift ***
💉 Loading .dylib ...
objc[8664]: Class _TtC4test14ViewController is implemented in both /Users/tangjie/Library/Developer/CoreSimulator/Devices/357672B1-E75A-4202-BD26-1F4975103844/data/Containers/Bundle/Application/801EEC19-2668-4B27-ADE8-B0024F925EC7/test.app/test (0x104a45710) and /Users/tangjie/Library/Containers/com.johnholdsworth.InjectionIII/Data/eval101.dylib (0x12a553748). One of the two will be used. Which one is undefined.
💉 Loaded .dylib - Ignore any duplicate class warning ^
💉 Injected 'ViewController'

Hello! The above is the contents of the crash printing when I execute command+s. What should I do?