报错信息

:-1: Multiple commands produce '/Users/liuxiansen/Library/Developer/Xcode/DerivedData/自定义cell-ezopwhgwzygnzdgfrazsovcbmxqn/Build/Products/Debug-iphonesimulator/自定义cell.app/Info.plist':
1) Target '自定义cell' (project '自定义cell') has copy command from '/Users/liuxiansen/workspace/自定义cell/自定义cell/MJExtension/Info.plist' to '/Users/liuxiansen/Library/Developer/Xcode/DerivedData/自定义cell-ezopwhgwzygnzdgfrazsovcbmxqn/Build/Products/Debug-iphonesimulator/自定义cell.app/Info.plist'
2) Target '自定义cell' (project '自定义cell') has process command with output '/Users/liuxiansen/Library/Developer/Xcode/DerivedData/自定义cell-ezopwhgwzygnzdgfrazsovcbmxqn/Build/Products/Debug-iphonesimulator/自定义cell.app/Info.plist'

解决方法一：
file->project settings
修改Build System为:Legacy Build System。

屏幕快照 2018-12-21 下午5.18.12.png

解决方法二：

屏幕快照 2018-12-21 下午5.24.47.png