Can't set SubSystem to WindowedApp

[Patrick-W-McMahon]

If you go /WalnutApp/premake5.lua and change the following:
kind "ConsoleApp" to kind "WindowedApp"
then run premake it will build the project but when running the project you will get the following error.

Severity Code Description Project File Line Suppression State Details
Error LNK2019 unresolved external symbol WinMain referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@yahxz) WalnutApp .....\Walnut\WalnutApp\MSVCRTD.lib(exe_winmain.obj) 1

the only way the project works is in Console but i would like to build it so it doesn't show the console at startup