Plugin Task Failed: Cannot open include file: 'Runnable.h': No such file or directory. (Plugin uses Multi-threading)

Wow 5 minutes later, I fixed it! Haha.

All I did was use the full include path to Runnable.h, ThreadSingleton.h and RunnableThread.h

Then I went to Edit>Plugins>(Find my plugin)>Package to package my plugin

Plugin compiled successfully!