I got a warning from delete some cpp folder in the demo

MacOSX and iOS
1

warning: Linker: Failed to resolve symbol ‘__Z22invokeChildProcessDemoRKN4juce6StringE’. Attempts to use it will crash your live build.
How can I fix these two problem?

Screen Shot 2017-04-28 at 9.13.28 PM.png2560×1600 1.07 MB
Screen Shot 2017-04-28 at 9.12.52 PM.png2560×1600 1.28 MB